JS+Canvas实现的俄罗斯方块游戏完整实例

183 阅读 0 评论 121 点赞

我是靠谱客的博主眼睛大饼干，这篇文章主要介绍JS+Canvas实现的俄罗斯方块游戏完整实例，现在分享给大家，希望可以做个参考。

本文实例讲述了JS+Canvas实现的俄罗斯方块游戏。分享给大家供大家参考，具体如下：

试玩（没有考虑兼容低版本浏览器）：

**********************************************************************
9月3日更新：
修复了隐藏的比较深的BUG
加上暂停、再来一次功能
速度随分数增高而递减
添加log日志
*********************************************************************

通过写这个游戏收获几点：

1、canvas的isPointInPath方法不支持fillRect、strokeRect的上下文。

2、canvas有内边距（padding）时，传入isPointInPath方法的坐标需要减去padding值。

3、通过json的方法JSON.parse(JSON.stringify(Object))可以快速克隆Object对象，但是要注意：当Object对象里有方法时，克隆过来依然是引用关系。

源码：

复制代码

<!DOCTYPE html>
<html lang="zh-CN">
  <head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>canvas版俄罗斯方块</title>
  <style>
  #canvas{
    background: #272822;
    display: block;
    margin: 0 auto;
  }
  </style>
</head>
<body>
<p style="text-align: center;">操作：↑变形；↓下移；←左移；→右移</p>
<canvas id="canvas" width="640" height="600">
  您的浏览器不支持canvas！
</canvas>
<script>
/****************************
作者：王美建 2015年9月3日20:30:35
*后续可添加怪异变形，类似于L可变成Z
*积分随关卡递增
*初始化部分historyBlock
****************************/
var tetris = {
  canvas : document.getElementById("canvas"),
  ctx : this.canvas.getContext("2d"),
  width : 481,
  height : 600,
  logLen: 8,
  mapColor: "#464741",
  logColor: "green",
  status: 'ready',
  unit : 30,
  curText : "开始",
  blockData : function(index, row, col){
    var r = row || 1,
      c = col || Math.floor((this.col - 3)/2) + 2,
      block = [
        [
          {color: 'red', status: 1, data: [{x: r, y:c-1}, {x: r+1, y:c-1}, {x: r+1, y:c}, {x: r+1, y:c+1}], center: {x: r, y: c}},
          {color: 'red', status: 2, data: [{x: r-1, y:c-1}, {x: r-1, y:c}, {x: r, y:c-1}, {x: r+1, y:c-1}], center: {x: r, y: c}},
          {color: 'red', status: 3, data: [{x: r-1, y:c-1}, {x: r-1, y:c}, {x: r-1, y:c+1}, {x: r, y:c+1}], center: {x: r, y: c}},
          {color: 'red', status: 4, data: [{x: r-1, y:c+1}, {x: r, y:c+1}, {x: r+1, y:c+1}, {x: r+1, y:c}], center: {x: r, y: c}}
        ],
        [
          {color: 'green', status: 1, center: {x: r, y:c}, data: [{x: r, y:c+1}, {x: r+1, y:c-1}, {x: r+1, y:c}, {x: r+1, y:c+1}]},
          {color: 'green', status: 2, center: {x: r, y:c}, data: [{x: r-1, y:c-1}, {x: r, y:c-1}, {x: r+1, y:c-1}, {x: r+1, y:c}]},
          {color: 'green', status: 3, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r-1, y:c-1}, {x: r-1, y:c}, {x: r-1, y:c+1}]},
          {color: 'green', status: 4, center: {x: r, y:c}, data: [{x: r-1, y:c}, {x: r-1, y:c+1}, {x: r, y:c+1}, {x: r+1, y:c+1}]}
        ],
        [
          {color: 'blue', status: 1, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r+1, y:c}, {x: r+1, y:c+1}]},
          {color: 'blue', status: 2, center: {x: r, y:c}, data: [{x: r+1, y:c-1}, {x: r, y:c-1}, {x: r, y:c}, {x: r-1, y:c}]}
        ],
        [
          {color: 'orange', status: 1, center: {x: r, y:c}, data: [{x: r+1, y:c-1}, {x: r+1, y:c}, {x: r, y:c}, {x: r, y:c+1}]},
          {color: 'orange', status: 2, center: {x: r, y:c}, data: [{x: r-1, y:c}, {x: r, y:c}, {x: r, y:c+1}, {x: r+1, y:c+1}]}
        ],
        [
          {color: 'yellow', status: 1, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r+1, y:c-1}, {x: r+1, y:c}]}
        ],
        [
          {color: 'aqua', status: 1, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r, y:c+1}, {x: r-1, y:c}]},
          {color: 'aqua', status: 2, center: {x: r, y:c}, data: [{x: r+1, y:c}, {x: r, y:c}, {x: r, y:c+1}, {x: r-1, y:c}]},
          {color: 'aqua', status: 3, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r, y:c+1}, {x: r+1, y:c}]},
          {color: 'aqua', status: 4, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r+1, y:c}, {x: r-1, y:c}]}
        ],
        [
          {color: 'indigo', status: 1, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r, y:c+1}, {x: r, y:c+2}]},
          {color: 'indigo', status: 2, center: {x: r, y:c}, data: [{x: r-2, y:c}, {x: r-1, y:c}, {x: r, y:c}, {x: r+1, y:c}]}
        ]
      ]
    return block[index];
  },
  init : function(){
    var self = this;
    self.reset();
    self.addEvent("keydown", window, function(ev){
      var ev = ev || window.event,
        code = ev.keycode || ev.which;
      if(self.handle[code] && self.status === "play"){
        self.handle[code].call(self);
        self.createMap();
        ev.preventDefault();
      }
    })
    self.addEvent("click", document, function(ev){
      self.createMap(ev);
    })
    return this;
  },
  reset: function(){
    var self = this;
    self.score = 0;
    self.speed = 1000;
    self.log = [];
    self.historyBlock = [];
    self.row = Math.floor(self.height/self.unit);
    self.col = Math.floor(self.width/self.unit);
    self.curBlockIndex = Math.round(Math.random()*6);
    self.curBlocks = self.blockData(self.curBlockIndex);
    self.curBlock = self.curBlocks[0];
    self.createNext().createMap();
    return this;
  },
  createNext: function(){
    var self = this;
    self.nextBlockIndex = self.status === "ready" ? self.curBlockIndex : Math.round(Math.random()*6);
    self.nextBlocks = self.blockData(self.nextBlockIndex, 4, self.col+3);
    self.nextBlock = self.nextBlocks[0];
    return this;
  },
  addEvent : function(ev, ele, callback){
    if( ele.addEventListener ){
      ele.addEventListener(ev,callback,false);
    }else{
      ele.attachEvent("on"+ev, callback);
    }
  },
  createMap : function(ev){
    var self = this,
      ctx = self.ctx;
    ctx.clearRect(0, 0, self.canvas.width, self.canvas.height);
    for (var i = 0; i < self.col; i++) {
      for (var j = 0; j < self.row; j++) {
        ctx.save();
        ctx.strokeStyle = self.mapColor;
        ctx.strokeRect(i*self.unit, j*self.unit, self.unit, self.unit);
        ctx.stroke();
        ctx.restore();
      };
    };
    self.showText(ev).createBlock().createLog();
    if(self.status !== "ready"){
      self.drawRect(self.curBlock.data);
    }
    return this;
  },
  createBlock : function(){
    var self = this,
      block = self.curBlock.data;
    self.drawRect(self.historyBlock);
    if(self.collide(40, true)){
      block.map(function(val){
        val.x--;
      })
      setTimeout(function(){
        clearInterval(self.timer);
        if(localStorage.getItem("score") === null){
          localStorage.setItem("score", self.score);
        }else if(localStorage.getItem("score") - self.score < 0 ){
          localStorage.setItem("score", self.score);
          alert("新纪录！"+self.score+"分！");
          self.printLog({log:"新纪录！"+self.score+"分！", color: 'red'});
          return;
        }
        self.status = "over";
        self.curText = "重来";
        self.showText();
        self.printLog({log:"GAME OVER", color: 'red'});
      },10)
    }
    return this;
  },
  drawRect : function(block){
    var self = this;
    for (var i = 0; i < block.length; i++) {
      self.ctx.save();
      self.ctx.fillStyle = block[i].color || self.curBlock.color;
      self.ctx.strokeStyle = self.mapColor;
      self.ctx.fillRect((block[i].y - 1)*self.unit, (block[i].x - 1)*self.unit, self.unit, self.unit );
      self.ctx.strokeRect((block[i].y - 1)*self.unit, (block[i].x - 1)*self.unit, self.unit, self.unit );
      self.ctx.restore();
    };
  },
  move : function(){
    var self = this;
    clearInterval(self.timer);
    self.timer = setInterval(function(){
      // 实时刷新数据 大坑！
      var curBlock = self.curBlock,
        data = self.curBlock.data;
      if( self.collide() || data.some(function(val){
        return val.x + 1 > self.row;
      }) ){
        clearInterval(self.timer);
        self.historyBlock.push.apply(self.historyBlock, data.map(function(val){
            val.color = curBlock.color;
            return val;
        }));
        self.remove();
        self.curBlockIndex = self.nextBlockIndex;
        self.curBlocks = self.blockData(self.curBlockIndex);
        self.curBlock = self.curBlocks[0];
        self.createNext().createMap().move();
        return false;
      }
      for (var i = 0; i < data.length; i++) {
        data[i].x++;
      };
      self.curBlock.center.x++;
      self.createMap();
    }, self.speed)
    return this;
  },
  remove : function(){
    var self = this,
      count = {},
      n = 0,
      maxRow = 0,
      delArr = [],
      block = self.historyBlock;
    for (var i = 0; i < block.length; i++) {
      if(count[block[i].x]){
        count[block[i].x].length += 1;
      }else{
        count[block[i].x] = [1];
      }
    };
    console.log( count )
    for (var attr in count) {
      if(count[attr].length === self.col){
        n++;
        //maxRow = attr > maxRow ? attr : maxRow;
        for (var i = 0; i < block.length; i++) {
          if(block[i].x == attr){
            delArr = block.splice(i, 1);
            i--;
          }
        };
        count[attr].length = 0;
        block.forEach(function(val){
          val.x < attr && (val.x += 1);
        })
      }
    };
    // 边消除边下降会死循环
    if(n > 0){
      self.score += n*100;
      self.printLog("得分+"+n*100);
      // 一次消除3行奖励100分
      if(n === 3){
        self.score += 100;
        self.printLog("奖励"+100+"分~");
      }
      // 一次消除4行奖励200分
      if(n === 4){
        self.score += 200;
        self.printLog("奖励"+200+"分~");
      }
      /*block.forEach(function(val){
        val.x < maxRow && (val.x += n);
      })*/
      self.changeSpeed();
    }
  },
  changeSpeed: function(){
    var self = this;
    if( self.score >= 3000 && self.score < 5000 ){
      self.speed = 800;
    }else if( self.score >= 5000 && self.score < 10000 ){
      self.speed = 600;
      self.score += 100;
    }else if( self.score >= 10000 && self.score < 20000 ){
      self.speed = 400;
      self.score += 150;
    }else if( self.score >= 20000 && self.score < 40000 ){
      self.speed = 200;
      self.score += 200;
    }else if( self.score >= 40000 ){
      self.speed = 100;
      self.score += 300;
    }
    return this;
  },
  collide : function(direction, isCreate){
    var block = JSON.parse(JSON.stringify(this.curBlock)),
      result = false,
      self = this;
    direction = direction || 40;
    // direction:碰撞方向，默认下方
    if(direction === 37){
      self.mLeft(block);
    }else if(direction === 38){
      block = self.distortion(block);
    }else if(direction === 39){
      self.mRight(block);
    }else if(direction === 40 && !isCreate){
      // 非新增方块则往下移动一格
      block.data.forEach(function(val){
        val.x++;
      })
    }
    result = block.data.some(function(val){
      return (val.x > self.row || val.y < 1 || val.y > self.col);
    })
    if(result){
      return result;
    }else{
      return block.data.some(function(val){
        return self.historyBlock.some(function(value){
          return (value.x === val.x && value.y === val.y);
        })
      })
    }
  },
  mLeft : function(block){
    if(block.data.every(function(val){
      return val.y - 1 >= 1;
    })){
      block.data.forEach(function(val){
        val.y--;
      })
      block.center.y--;
    }
  },
  mRight : function(block){
    var self = this;
    if(block.data.every(function(val){
      return val.y + 1 <= self.col;
    })){
      block.data.forEach(function(val){
        val.y++;
      })
      block.center.y++;
    }
  },
  distortion : function(block){
    var self = this,
      curRow = block.center.x,
      curCol = block.center.y,
      status = block.status + 1 > self.curBlocks.length ? 1 : block.status + 1;
    self.curBlocks = self.blockData(self.curBlockIndex, block.center.x, block.center.y);
    return self.curBlocks[status-1];
  },
  // 控制：上（变形）、右（右移）、下（下移）、左（左移）
  handle : {
    // 左键 code 37
    37: function(){
      var self = this;
      if(!self.collide(37)){
        self.mLeft(self.curBlock);
      }
    },
    // 上键 code 38
    38: function(){
      var self = this;
      if(!self.collide(38)){
        self.curBlock = self.distortion(self.curBlock);
      }
    },
    // 右键 code 39
    39: function(){
      var self = this;
      if(!self.collide(39)){
        self.mRight(self.curBlock);
      }
    },
    // 下键 code 40
    40: function(){
      var self = this;
      if(!self.collide()){
        self.curBlock.data.forEach(function(val){
          val.x++;
        })
        self.curBlock.center.x++;
      }
    }
  },
  showText: function(ev){
    var self = this,
      ctx = self.ctx;
    ctx.clearRect(self.width, 0, self.canvas.width - self.width, self.height);
    ctx.save();
    ctx.beginPath();
    ctx.font = "20px Verdana";
    ctx.fillStyle = "green";
    ctx.fillText("下一个:", self.width+10, 30);
    ctx.fillText("分数:", self.width+10, 200);
    ctx.fillText("速度:", self.width+10, 260);
    ctx.fillText("作者:王美建", self.width+10, 580);
    ctx.fillStyle = "red";
    ctx.fillText(self.score, self.width+10, 230);
    ctx.fillText(self.speed + "毫秒", self.width+10, 290);
    ctx.fillStyle = "green";
    ctx.fillRect(self.width + 30, 320, 100, 40);
    // isPointInPath对fillRect()兼容不好 又一个大坑！
    ctx.rect(self.width + 30, 320, 100, 40);
    if( ev && ctx.isPointInPath(ev.layerX, ev.layerY) ){
      switch(self.status){
        case "ready":
        self.status = "play";
        self.curText = "暂停";
        self.log = ["开始游戏."];
        self.createNext().move();
        break;
        case "play":
        self.status = "paush";
        self.curText = "继续";
        clearInterval(self.timer);
        self.printLog("暂停.");
        break;
        case "paush":
        self.status = "play";
        self.curText = "暂停";
        self.printLog("继续游戏~");
        self.move();
        break;
        case "over":
        self.status = "play";
        self.curText = "暂停";
        self.reset().move();
        self.printLog("开始游戏~");
        break;
      }
    }
    ctx.fillStyle = "black";
    ctx.fillText(self.curText, self.width+60, 350);
    ctx.restore();
    ctx.closePath();
    self.nextBlock.data.forEach(function(val){
      val.color = self.nextBlock.color;
    })
    self.drawRect(self.nextBlock.data);
    return this;
  },
  printLog: function(log){
    var self = this;
    if(log){
      self.log.unshift(log);
      self.log.length > self.logLen && (self.log.length = self.logLen);
    }
    self.createLog();
    return this;
  },
  createLog: function(){
    var self = this,
      ctx = self.ctx;
    // 清除log
    ctx.clearRect(self.width+10, 380, 136, 170);
    self.log.forEach(function(val, index){
      if(val){
        ctx.save();
        ctx.font = "16px Verdana";
        ctx.fillStyle = val.color || self.logColor,
        ctx.fillText(val.log || val, self.width+10, 400+index*22);
        ctx.restore();
      }
    })
    return this;
  }
}
tetris.init();
</script>
</body>
</html>

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
<!DOCTYPE html>
<html lang="zh-CN">
  <head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>canvas版俄罗斯方块</title>
  <style>
  #canvas{
    background: #272822;
    display: block;
    margin: 0 auto;
  }
  </style>
</head>
<body>
<p style="text-align: center;">操作：↑变形；↓下移；←左移；→右移</p>
<canvas id="canvas" width="640" height="600">
  您的浏览器不支持canvas！
</canvas>
<script>
/****************************
作者：王美建 2015年9月3日20:30:35
*后续可添加怪异变形，类似于L可变成Z
*积分随关卡递增
*初始化部分historyBlock
****************************/
var tetris = {
  canvas : document.getElementById("canvas"),
  ctx : this.canvas.getContext("2d"),
  width : 481,
  height : 600,
  logLen: 8,
  mapColor: "#464741",
  logColor: "green",
  status: 'ready',
  unit : 30,
  curText : "开始",
  blockData : function(index, row, col){
    var r = row || 1,
      c = col || Math.floor((this.col - 3)/2) + 2,
      block = [
        [
          {color: 'red', status: 1, data: [{x: r, y:c-1}, {x: r+1, y:c-1}, {x: r+1, y:c}, {x: r+1, y:c+1}], center: {x: r, y: c}},
          {color: 'red', status: 2, data: [{x: r-1, y:c-1}, {x: r-1, y:c}, {x: r, y:c-1}, {x: r+1, y:c-1}], center: {x: r, y: c}},
          {color: 'red', status: 3, data: [{x: r-1, y:c-1}, {x: r-1, y:c}, {x: r-1, y:c+1}, {x: r, y:c+1}], center: {x: r, y: c}},
          {color: 'red', status: 4, data: [{x: r-1, y:c+1}, {x: r, y:c+1}, {x: r+1, y:c+1}, {x: r+1, y:c}], center: {x: r, y: c}}
        ],
        [
          {color: 'green', status: 1, center: {x: r, y:c}, data: [{x: r, y:c+1}, {x: r+1, y:c-1}, {x: r+1, y:c}, {x: r+1, y:c+1}]},
          {color: 'green', status: 2, center: {x: r, y:c}, data: [{x: r-1, y:c-1}, {x: r, y:c-1}, {x: r+1, y:c-1}, {x: r+1, y:c}]},
          {color: 'green', status: 3, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r-1, y:c-1}, {x: r-1, y:c}, {x: r-1, y:c+1}]},
          {color: 'green', status: 4, center: {x: r, y:c}, data: [{x: r-1, y:c}, {x: r-1, y:c+1}, {x: r, y:c+1}, {x: r+1, y:c+1}]}
        ],
        [
          {color: 'blue', status: 1, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r+1, y:c}, {x: r+1, y:c+1}]},
          {color: 'blue', status: 2, center: {x: r, y:c}, data: [{x: r+1, y:c-1}, {x: r, y:c-1}, {x: r, y:c}, {x: r-1, y:c}]}
        ],
        [
          {color: 'orange', status: 1, center: {x: r, y:c}, data: [{x: r+1, y:c-1}, {x: r+1, y:c}, {x: r, y:c}, {x: r, y:c+1}]},
          {color: 'orange', status: 2, center: {x: r, y:c}, data: [{x: r-1, y:c}, {x: r, y:c}, {x: r, y:c+1}, {x: r+1, y:c+1}]}
        ],
        [
          {color: 'yellow', status: 1, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r+1, y:c-1}, {x: r+1, y:c}]}
        ],
        [
          {color: 'aqua', status: 1, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r, y:c+1}, {x: r-1, y:c}]},
          {color: 'aqua', status: 2, center: {x: r, y:c}, data: [{x: r+1, y:c}, {x: r, y:c}, {x: r, y:c+1}, {x: r-1, y:c}]},
          {color: 'aqua', status: 3, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r, y:c+1}, {x: r+1, y:c}]},
          {color: 'aqua', status: 4, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r+1, y:c}, {x: r-1, y:c}]}
        ],
        [
          {color: 'indigo', status: 1, center: {x: r, y:c}, data: [{x: r, y:c-1}, {x: r, y:c}, {x: r, y:c+1}, {x: r, y:c+2}]},
          {color: 'indigo', status: 2, center: {x: r, y:c}, data: [{x: r-2, y:c}, {x: r-1, y:c}, {x: r, y:c}, {x: r+1, y:c}]}
        ]
      ]
    return block[index];
  },
  init : function(){
    var self = this;
    self.reset();
    self.addEvent("keydown", window, function(ev){
      var ev = ev || window.event,
        code = ev.keycode || ev.which;
      if(self.handle[code] && self.status === "play"){
        self.handle[code].call(self);
        self.createMap();
        ev.preventDefault();
      }
    })
    self.addEvent("click", document, function(ev){
      self.createMap(ev);
    })
    return this;
  },
  reset: function(){
    var self = this;
    self.score = 0;
    self.speed = 1000;
    self.log = [];
    self.historyBlock = [];
    self.row = Math.floor(self.height/self.unit);
    self.col = Math.floor(self.width/self.unit);
    self.curBlockIndex = Math.round(Math.random()*6);
    self.curBlocks = self.blockData(self.curBlockIndex);
    self.curBlock = self.curBlocks[0];
    self.createNext().createMap();
    return this;
  },
  createNext: function(){
    var self = this;
    self.nextBlockIndex = self.status === "ready" ? self.curBlockIndex : Math.round(Math.random()*6);
    self.nextBlocks = self.blockData(self.nextBlockIndex, 4, self.col+3);
    self.nextBlock = self.nextBlocks[0];
    return this;
  },
  addEvent : function(ev, ele, callback){
    if( ele.addEventListener ){
      ele.addEventListener(ev,callback,false);
    }else{
      ele.attachEvent("on"+ev, callback);
    }
  },
  createMap : function(ev){
    var self = this,
      ctx = self.ctx;
    ctx.clearRect(0, 0, self.canvas.width, self.canvas.height);
    for (var i = 0; i < self.col; i++) {
      for (var j = 0; j < self.row; j++) {
        ctx.save();
        ctx.strokeStyle = self.mapColor;
        ctx.strokeRect(i*self.unit, j*self.unit, self.unit, self.unit);
        ctx.stroke();
        ctx.restore();
      };
    };
    self.showText(ev).createBlock().createLog();
    if(self.status !== "ready"){
      self.drawRect(self.curBlock.data);
    }
    return this;
  },
  createBlock : function(){
    var self = this,
      block = self.curBlock.data;
    self.drawRect(self.historyBlock);
    if(self.collide(40, true)){
      block.map(function(val){
        val.x--;
      })
      setTimeout(function(){
        clearInterval(self.timer);
        if(localStorage.getItem("score") === null){
          localStorage.setItem("score", self.score);
        }else if(localStorage.getItem("score") - self.score < 0 ){
          localStorage.setItem("score", self.score);
          alert("新纪录！"+self.score+"分！");
          self.printLog({log:"新纪录！"+self.score+"分！", color: 'red'});
          return;
        }
        self.status = "over";
        self.curText = "重来";
        self.showText();
        self.printLog({log:"GAME OVER", color: 'red'});
      },10)
    }
    return this;
  },
  drawRect : function(block){
    var self = this;
    for (var i = 0; i < block.length; i++) {
      self.ctx.save();
      self.ctx.fillStyle = block[i].color || self.curBlock.color;
      self.ctx.strokeStyle = self.mapColor;
      self.ctx.fillRect((block[i].y - 1)*self.unit, (block[i].x - 1)*self.unit, self.unit, self.unit );
      self.ctx.strokeRect((block[i].y - 1)*self.unit, (block[i].x - 1)*self.unit, self.unit, self.unit );
      self.ctx.restore();
    };
  },
  move : function(){
    var self = this;
    clearInterval(self.timer);
    self.timer = setInterval(function(){
      // 实时刷新数据 大坑！
      var curBlock = self.curBlock,
        data = self.curBlock.data;
      if( self.collide() || data.some(function(val){
        return val.x + 1 > self.row;
      }) ){
        clearInterval(self.timer);
        self.historyBlock.push.apply(self.historyBlock, data.map(function(val){
            val.color = curBlock.color;
            return val;
        }));
        self.remove();
        self.curBlockIndex = self.nextBlockIndex;
        self.curBlocks = self.blockData(self.curBlockIndex);
        self.curBlock = self.curBlocks[0];
        self.createNext().createMap().move();
        return false;
      }
      for (var i = 0; i < data.length; i++) {
        data[i].x++;
      };
      self.curBlock.center.x++;
      self.createMap();
    }, self.speed)
    return this;
  },
  remove : function(){
    var self = this,
      count = {},
      n = 0,
      maxRow = 0,
      delArr = [],
      block = self.historyBlock;
    for (var i = 0; i < block.length; i++) {
      if(count[block[i].x]){
        count[block[i].x].length += 1;
      }else{
        count[block[i].x] = [1];
      }
    };
    console.log( count )
    for (var attr in count) {
      if(count[attr].length === self.col){
        n++;
        //maxRow = attr > maxRow ? attr : maxRow;
        for (var i = 0; i < block.length; i++) {
          if(block[i].x == attr){
            delArr = block.splice(i, 1);
            i--;
          }
        };
        count[attr].length = 0;
        block.forEach(function(val){
          val.x < attr && (val.x += 1);
        })
      }
    };
    // 边消除边下降会死循环
    if(n > 0){
      self.score += n*100;
      self.printLog("得分+"+n*100);
      // 一次消除3行奖励100分
      if(n === 3){
        self.score += 100;
        self.printLog("奖励"+100+"分~");
      }
      // 一次消除4行奖励200分
      if(n === 4){
        self.score += 200;
        self.printLog("奖励"+200+"分~");
      }
      /*block.forEach(function(val){
        val.x < maxRow && (val.x += n);
      })*/
      self.changeSpeed();
    }
  },
  changeSpeed: function(){
    var self = this;
    if( self.score >= 3000 && self.score < 5000 ){
      self.speed = 800;
    }else if( self.score >= 5000 && self.score < 10000 ){
      self.speed = 600;
      self.score += 100;
    }else if( self.score >= 10000 && self.score < 20000 ){
      self.speed = 400;
      self.score += 150;
    }else if( self.score >= 20000 && self.score < 40000 ){
      self.speed = 200;
      self.score += 200;
    }else if( self.score >= 40000 ){
      self.speed = 100;
      self.score += 300;
    }
    return this;
  },
  collide : function(direction, isCreate){
    var block = JSON.parse(JSON.stringify(this.curBlock)),
      result = false,
      self = this;
    direction = direction || 40;
    // direction:碰撞方向，默认下方
    if(direction === 37){
      self.mLeft(block);
    }else if(direction === 38){
      block = self.distortion(block);
    }else if(direction === 39){
      self.mRight(block);
    }else if(direction === 40 && !isCreate){
      // 非新增方块则往下移动一格
      block.data.forEach(function(val){
        val.x++;
      })
    }
    result = block.data.some(function(val){
      return (val.x > self.row || val.y < 1 || val.y > self.col);
    })
    if(result){
      return result;
    }else{
      return block.data.some(function(val){
        return self.historyBlock.some(function(value){
          return (value.x === val.x && value.y === val.y);
        })
      })
    }
  },
  mLeft : function(block){
    if(block.data.every(function(val){
      return val.y - 1 >= 1;
    })){
      block.data.forEach(function(val){
        val.y--;
      })
      block.center.y--;
    }
  },
  mRight : function(block){
    var self = this;
    if(block.data.every(function(val){
      return val.y + 1 <= self.col;
    })){
      block.data.forEach(function(val){
        val.y++;
      })
      block.center.y++;
    }
  },
  distortion : function(block){
    var self = this,
      curRow = block.center.x,
      curCol = block.center.y,
      status = block.status + 1 > self.curBlocks.length ? 1 : block.status + 1;
    self.curBlocks = self.blockData(self.curBlockIndex, block.center.x, block.center.y);
    return self.curBlocks[status-1];
  },
  // 控制：上（变形）、右（右移）、下（下移）、左（左移）
  handle : {
    // 左键 code 37
    37: function(){
      var self = this;
      if(!self.collide(37)){
        self.mLeft(self.curBlock);
      }
    },
    // 上键 code 38
    38: function(){
      var self = this;
      if(!self.collide(38)){
        self.curBlock = self.distortion(self.curBlock);
      }
    },
    // 右键 code 39
    39: function(){
      var self = this;
      if(!self.collide(39)){
        self.mRight(self.curBlock);
      }
    },
    // 下键 code 40
    40: function(){
      var self = this;
      if(!self.collide()){
        self.curBlock.data.forEach(function(val){
          val.x++;
        })
        self.curBlock.center.x++;
      }
    }
  },
  showText: function(ev){
    var self = this,
      ctx = self.ctx;
    ctx.clearRect(self.width, 0, self.canvas.width - self.width, self.height);
    ctx.save();
    ctx.beginPath();
    ctx.font = "20px Verdana";
    ctx.fillStyle = "green";
    ctx.fillText("下一个:", self.width+10, 30);
    ctx.fillText("分数:", self.width+10, 200);
    ctx.fillText("速度:", self.width+10, 260);
    ctx.fillText("作者:王美建", self.width+10, 580);
    ctx.fillStyle = "red";
    ctx.fillText(self.score, self.width+10, 230);
    ctx.fillText(self.speed + "毫秒", self.width+10, 290);
    ctx.fillStyle = "green";
    ctx.fillRect(self.width + 30, 320, 100, 40);
    // isPointInPath对fillRect()兼容不好 又一个大坑！
    ctx.rect(self.width + 30, 320, 100, 40);
    if( ev && ctx.isPointInPath(ev.layerX, ev.layerY) ){
      switch(self.status){
        case "ready":
        self.status = "play";
        self.curText = "暂停";
        self.log = ["开始游戏."];
        self.createNext().move();
        break;
        case "play":
        self.status = "paush";
        self.curText = "继续";
        clearInterval(self.timer);
        self.printLog("暂停.");
        break;
        case "paush":
        self.status = "play";
        self.curText = "暂停";
        self.printLog("继续游戏~");
        self.move();
        break;
        case "over":
        self.status = "play";
        self.curText = "暂停";
        self.reset().move();
        self.printLog("开始游戏~");
        break;
      }
    }
    ctx.fillStyle = "black";
    ctx.fillText(self.curText, self.width+60, 350);
    ctx.restore();
    ctx.closePath();
    self.nextBlock.data.forEach(function(val){
      val.color = self.nextBlock.color;
    })
    self.drawRect(self.nextBlock.data);
    return this;
  },
  printLog: function(log){
    var self = this;
    if(log){
      self.log.unshift(log);
      self.log.length > self.logLen && (self.log.length = self.logLen);
    }
    self.createLog();
    return this;
  },
  createLog: function(){
    var self = this,
      ctx = self.ctx;
    // 清除log
    ctx.clearRect(self.width+10, 380, 136, 170);
    self.log.forEach(function(val, index){
      if(val){
        ctx.save();
        ctx.font = "16px Verdana";
        ctx.fillStyle = val.color || self.logColor,
        ctx.fillText(val.log || val, self.width+10, 400+index*22);
        ctx.restore();
      }
    })
    return this;
  }
}
tetris.init();
</script>
</body>
</html>

持续优化中……

更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript数据结构与算法技巧总结》、《JavaScript数学运算用法总结》、《JavaScript切换特效与技巧总结》、《JavaScript查找算法技巧总结》、《JavaScript动画特效与技巧汇总》、《JavaScript错误与调试技巧总结》及《JavaScript遍历算法与技巧总结》

希望本文所述对大家JavaScript程序设计有所帮助。