javascript 放大镜 v1.0 基于Yui2 实现的放大镜效果

new flower.init("Demo","mag");
new flower.init("Demo1","mag1",{
max:3,zoomType:false,zoomWidth:200,zoomHeight:200,iframe:true,zIndex:666,cursor:"row-resize"
});

defaultConfig={
/**
* 放大镜的倍数
* @type Number
*/
max:3,
/**
* *放大镜鼠标移动层的透明度
* @type Number
*/
opacity:0.5,
/**显示效果 false为默认,true为反色效果
* @type Boolean
*/
zoomType:false,
/**显示动画
* @type String
*/
showEffect:'fadein',
/**放大层的宽度
* @type Number
*/
zoomWidth:'auto',
/**放大层的高度
* @type Number
*/
zoomHeight:'auto',
/**鼠标层的宽度
* @type Number
*/
tipsWidth:'auto',
/**鼠标层的高度
* @type Number
*/
tipsHeight:'auto',
/**iframe遮盖select
* @type Boolean
*/
iframe:false,
/**iframe zIndex
* @type Number
*/
zIndex:999,
/**光标样式
* @type String
*/
cursor:"auto"
};

namespace.init=function(content,mag,config){
/**
* 原始图片容器
* @type HTMLElement
*/
this.content=D.get(content);
/**
* 放大图片容器
* @type HTMLElement
*/
this.mag=D.get(mag);
/**
* 原始图片
* @type HTMLElement
*/
this.imgsource=this.content.getElementsByTagName("img")[0];
/**
* 放大图片
* @type HTMLElement
*/
this.img=this.mag.getElementsByTagName("img")[0];
/**
* 鼠标layer
* @type HTMLElement
*/
this.tips=this.content.getElementsByTagName("div")[0];
/**
* 配置参数
* @type this.tipsect
*/
this.config=L.merge(defaultConfig,config||{});
/*初始化*/
this._init();
};

_init:function(){
var self=this;
/*赋值src给大图*/
this.img.src=this.imgsource.src;
/*get边框长度*/
this.borderwidth=this.imgsource.offsetWidth - this.imgsource.clientWidth;
/**
* 设置大图片的宽度和高度 (X倍数)
* 设置大图容器的宽高和位置
* 设置鼠标跟随层的宽高和透明度
*/
this.pi=(this.config.zoomWidth!='auto'?this.config.zoomWidth/this.imgsource.offsetWidth:1)
this.pi2=(this.config.zoomHeight!='auto'?this.config.zoomHeight/this.imgsource.offsetHeight:1)
this._css(this.img,{
'position':'absolute',
'width':(this.config.zoomWidth!='auto' ?this.imgsource.offsetWidth*this.config.max*this.pi:this.imgsource.offsetWidth*this.config.max)+"px",
'height':(this.config.zoomHeight!='auto' ?this.imgsource.offsetHeight*this.config.max*this.pi2:this.imgsource.offsetHeight*this.config.max)+"px"
})._css(this.mag,{
'width':(this.config.zoomWidth!='auto' ? this.config.zoomWidth:this.imgsource.offsetWidth)+"px",
'height':(this.config.zoomHeight!='auto'?this.config.zoomHeight:this.imgsource.offsetHeight)+"px",
'left':D.getX(this.content)+this.imgsource.offsetWidth+10+"px",
'top':this.content.offsetTop+"px",
'position' : 'absolute',
"zIndex":this.config.zIndex
})._css(this.tips,{
'display':'',
'width':(this.config.tipsWidth!='auto' ? this.config.tipsWidth: parseInt(this.imgsource.offsetWidth / this.config.max)- this.borderwidth)+"px",
'height' : (this.config.tipsHeight!='auto' ? this.config.tipsHeight: parseInt(this.imgsource.offsetHeight / this.config.max) - this.borderwidth )+ 'px',
'opacity' : this.config.opacity
})
E.on(this.content,'mousemove',function(e){
self._css(self.mag,{"display":"block"})._css(self.tips,{"display":"block"})._move(e,self.tips)
})
E.on(this.content,'mouseout',function(e){
self._css(self.tips,{"display":"none"})._css(self.mag,{"display":"none"});
})
!!this.config.zoomType && E.on(self.tips,'mouseout',function(e){
self._css(self.imgsource,{"opacity":1});
self.tips.getElementsByTagName("img")[0] && self.tips.removeChild(self.tips.getElementsByTagName("img")[0]);
})
if(ie6 && !!this.config.iframe){
this._createIframe(this.mag);
}
D.setStyle(this.content,"cursor",this.config.cursor);
},

_css:function(el,json){
for(var s in json){
D.setStyle(el,s,json[s]);
}
return this;
},

_move:function(e,tips){
var point=E.getXY(e);
/**
* 提示层位置
* 大图显示位置
*/
this._css(tips,{
'top' : Math.min(Math.max(point[1] - this.content.offsetTop-parseInt(tips.offsetHeight)/2 ,0),this.content.offsetHeight - tips.offsetHeight) + 'px',
'left' : Math.min(Math.max(point[0] - this.content.offsetLeft-parseInt(tips.offsetWidth)/2 ,0),this.content.offsetWidth - tips.offsetWidth) + 'px'
})._css(this.img,{
'top':-(parseInt(tips.style.top) * this.config.max *this.pi2) + 'px',
'left' : - (parseInt(tips.style.left) * this.config.max *this.pi) + 'px'
});
/**
* 反色效果
*/
if(!!this.config.zoomType){
if(!tips.getElementsByTagName("img").length){
var imgs=document.createElement("img");
imgs.id='temp';
imgs.src=this.imgsource.src;
this._css(imgs,{
'width':this.imgsource.offsetWidth+"px",
'height':this.imgsource.offsetHeight+"px",
'position':'absolute'
});
tips.appendChild(imgs);
this.imgs=imgs;
}
this._css(this.imgsource,{
"opacity":0.2
})._css(this.tips,{
"opacity":1,
"visibility":"visible"
})._css(D.get("temp"),{
'top':-(parseInt(tips.style.top))+"px",
'left':-(parseInt(tips.style.left))+"px"
})
}
},

_createIframe:function(el){
var layer = document.createElement('iframe');
layer.tabIndex = '-1';
layer.src = 'javascript：false;';
el.appendChild(layer);
this._css(layer,{
"width":(this.config.zoomWidth!='auto' ? this.config.zoomWidth:this.imgsource.offsetWidth)+"px",
"height":(this.config.zoomHeight!='auto'?this.config.zoomHeight:this.imgsource.offsetHeight)+"px",
"zIndex":this.config.zIndex
})
}