电子商务网站上的常用的js放大镜效果

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我是靠谱客的博主传统外套，最近开发中收集的这篇文章主要介绍电子商务网站上的常用的js放大镜效果，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

复制代码代码如下:

 
jsFiddleRun again Edit this fiddle Result HTML 
<!DOCTYPE html> 
<html> 
<head> 
<meta charset="gb2312" /> 
<title>放大镜</title> 
<style> 
img{ vertical-align:bottom;} 
.mod_zoom{ overflow:hidden; zoom:1;} 
.mod_zoom .p1 { float:left; position:relative; height:350px; width:350px; margin-right:5px; } 
.mod_zoom .p1 .mask{ position:absolute; left:0; top:0; width:175px; height:175px; background-color:#fede4f; opacity:0.3; filter: alpha(opacity=30); display:none; } 
.mod_zoom .p2{ position:relative; width:400px; height:400px; overflow:hidden; display:none;} 
.mod_zoom .p2 .img{ position:absolute; left:0; top:0;} 
.mod_zoom .ph{width:100%; height:350px; position:absolute; top:0; left:0; cursor:crosshair; 
/*background-color:red*/ 
/*如果给它绑定事件处理函数，IE中不设置background-color属性就不触发事件*/ } 
</style> 
</head> 
<body> 
<div> 
<div class="mod_zoom"> 
<div class="p1" id="p1"> 
<img src="http://www.uoften.com/uploadfile/2018/0411/20180411124721271.jpg" id="z1" /> 
<span class="mask" id="m"></span> 
<span class="ph" id="eventproxy"></span> 
</div> 
<div class="p2" id="p2"> 
<img src="http://www.uoften.com/uploadfile/2018/0411/20180411124721784.jpg" class="img" id="z2" /> 
</div> 
</div> 
</div> 
<script> 
function PhotoZoomer(elements){ 
this.mask = elements.mask; //蒙版 
this.container = elements.container //原图容器 
this.originimg = elements.originimg; //原图 
this.eventproxy = elements.eventproxy; 
this.bigContainer = elements.bigContainer; //大图容器 
this.bigimg = elements.bigimg; //大图 
this.visible = false; 
this._bind(); 
} 
PhotoZoomer.prototype = { 
display: function(style){ 
var self = this; 
self.mask.style.display = style; 
self.bigContainer.style.display = style; 
}, 
//计算放大蒙版位置 
zoom: function(clientX, clientY){ 
var self = this, 
//位置比例 
rate = {}, 
//放大蒙版最大活动范围 
maxrange = { 
offsetLeft: self.container.offsetWidth - self.mask.offsetWidth, 
offsetTop: self.container.offsetHeight - self.mask.offsetHeight 
}, 
//mask left 
left = clientX - self.container.offsetLeft - self.mask.offsetWidth/2, 
//mask top 
top = clientY - self.container.offsetTop - self.mask.offsetHeight/2; 
if(left < 0) { 
left = 0; 
}else if(left> maxrange.offsetLeft) { 
left = maxrange.offsetLeft; 
} 
if(top < 0) { 
top = 0; 
}else if(top > maxrange.offsetTop){ 
top = maxrange.offsetTop; 
} 
//alert(maxrange.offsetTop); 
rate.left = left / maxrange.offsetLeft; 
rate.top = top / maxrange.offsetTop; 
self.mask.style.left = left + 'px'; 
self.mask.style.top = top + 'px'; 
self.bigimg.style.left = -rate.left * (self.bigimg.offsetWidth - self.bigContainer.offsetWidth) + "px"; 
self.bigimg.style.top = -rate.top * (self.bigimg.offsetHeight - self.bigContainer.offsetHeight) + "px"; 
}, 
_bind: function(){ 
var self = this; 
self.container.onmouseover = function(e){ 
e = e || window.event; 
var target = e.targe || e.srcElement; 
self.display("block"); 
this.visible = true; 
}; 
self.container.onmouseout = function(e){ 
e = e || window.event; 
var target = e.targe || e.srcElement; 
self.display("none"); 
this.visible = false; 
}; 
self.container.onmousemove = function(e){ 
e = e || window.event; 
if(!this.visible )return;//防止元素大小计算错误 
self.zoom(e.clientX, e.clientY); 
}; 
} 
}; 
function get(id){ 
return document.getElementById(id) 
} 
var elements = { 
mask: get("m"), 
container: get("p1"), 
originimg: get("z1"), 
bigContainer: get("p2"), 
bigimg: get("z2"), 
eventproxy: get("eventproxy") 
}; 
var zoomer = new PhotoZoomer(elements); 
// alert(elements.container.offsetParent.tagName) 
</script> 
</body> 
</html> 
<!DOCTYPE html> 
<html> 
<head> 
<meta charset="gb2312" /> 
<title>放大镜</title> 
<style> 
img{ vertical-align:bottom;} 
.mod_zoom{ overflow:hidden; zoom:1;} 
.mod_zoom .p1 { float:left; position:relative; height:350px; width:350px; margin-right:5px; } 
.mod_zoom .p1 .mask{ position:absolute; left:0; top:0; width:175px; height:175px; background-color:#fede4f; opacity:0.3; filter: alpha(opacity=30); display:none; } 
.mod_zoom .p2{ position:relative; width:400px; height:400px; overflow:hidden; display:none;} 
.mod_zoom .p2 .img{ position:absolute; left:0; top:0;} 
.mod_zoom .ph{width:100%; height:350px; position:absolute; top:0; left:0; cursor:crosshair; 
/*background-color:red*/ 
/*如果给它绑定事件处理函数，IE中不设置background-color属性就不触发事件*/ } 
</style> 
</head> 
<body> 
<div> 
<div class="mod_zoom"> 
<div class="p1" id="p1"> 
<img src="http://www.uoften.com/uploadfile/2018/0411/20180411124721271.jpg" id="z1" /> 
<span class="mask" id="m"></span> 
<span class="ph" id="eventproxy"></span> 
</div> 
<div class="p2" id="p2"> 
<img src="http://www.uoften.com/uploadfile/2018/0411/20180411124721784.jpg" class="img" id="z2" /> 
</div> 
</div> 
</div> 
<script> 
function PhotoZoomer(elements){ 
this.mask = elements.mask; //蒙版 
this.container = elements.container //原图容器 
this.originimg = elements.originimg; //原图 
this.eventproxy = elements.eventproxy; 
this.bigContainer = elements.bigContainer; //大图容器 
this.bigimg = elements.bigimg; //大图 
this.visible = false; 
this._bind(); 
} 
PhotoZoomer.prototype = { 
display: function(style){ 
var self = this; 
self.mask.style.display = style; 
self.bigContainer.style.display = style; 
}, 
//计算放大蒙版位置 
zoom: function(clientX, clientY){ 
var self = this, 
//位置比例 
rate = {}, 
//放大蒙版最大活动范围 
maxrange = { 
offsetLeft: self.container.offsetWidth - self.mask.offsetWidth, 
offsetTop: self.container.offsetHeight - self.mask.offsetHeight 
}, 
//mask left 
left = clientX - self.container.offsetLeft - self.mask.offsetWidth/2, 
//mask top 
top = clientY - self.container.offsetTop - self.mask.offsetHeight/2; 
if(left < 0) { 
left = 0; 
}else if(left> maxrange.offsetLeft) { 
left = maxrange.offsetLeft; 
} 
if(top < 0) { 
top = 0; 
}else if(top > maxrange.offsetTop){ 
top = maxrange.offsetTop; 
} 
//alert(maxrange.offsetTop); 
rate.left = left / maxrange.offsetLeft; 
rate.top = top / maxrange.offsetTop; 
self.mask.style.left = left + 'px'; 
self.mask.style.top = top + 'px'; 
self.bigimg.style.left = -rate.left * (self.bigimg.offsetWidth - self.bigContainer.offsetWidth) + "px"; 
self.bigimg.style.top = -rate.top * (self.bigimg.offsetHeight - self.bigContainer.offsetHeight) + "px"; 
}, 
_bind: function(){ 
var self = this; 
self.container.onmouseover = function(e){ 
e = e || window.event; 
var target = e.targe || e.srcElement; 
self.display("block"); 
this.visible = true; 
}; 
self.container.onmouseout = function(e){ 
e = e || window.event; 
var target = e.targe || e.srcElement; 
self.display("none"); 
this.visible = false; 
}; 
self.container.onmousemove = function(e){ 
e = e || window.event; 
if(!this.visible )return;//防止元素大小计算错误 
self.zoom(e.clientX, e.clientY); 
}; 
} 
}; 
function get(id){ 
return document.getElementById(id) 
} 
var elements = { 
mask: get("m"), 
container: get("p1"), 
originimg: get("z1"), 
bigContainer: get("p2"), 
bigimg: get("z2"), 
eventproxy: get("eventproxy") 
}; 
var zoomer = new PhotoZoomer(elements); 
// alert(elements.container.offsetParent.tagName) 
</script> 
</body> 
</html> 