JQ面向对象的放大镜
Posted wyryuebanwan
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了JQ面向对象的放大镜相关的知识，希望对你有一定的参考价值。
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<link rel="stylesheet" type="text/css" href="css/style.css"/>
</head>
<body>
<div class="box">
<div class="smallBox">
<span class="mark"></span> <!--遮罩层-->
<span class="floa"></span>
<img src="img/small.jpg" />
</div>
<div class="bigBox">
<img src="img/big.jpg" />
</div>
</div>
//先导入jq库
<script src="js/jquery-1.11.3.js" type="text/javascript" charset="utf-8"></script>
<script src="js/fdj.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
//调用方法
new fdj();
</script>
</body>
</html>
style.css
*{
margin: 0;
padding: 0;
}
.box {
width: 171px;
height: 256px;
padding: 5px;
border: 1px solid #ccc;
position: relative;
}
.box .smallBox {
width: 171px;
height: 256px;
background: #eee;
position: relative;
}
.box .floa {
width: 50px;
height: 50px;
border: 1px solid #000;
background: #fff;
filter: alpha(opacity: 30);
opacity: 0.3;
position: absolute;
top: 0;
left: 0;
display: none;
}
.box .mark {
width: 100%;
height: 100%;
position: absolute;
z-index: 2;
left: 0px;
top: 0px;
background: red;
filter: alpha(opacity: 0);
opacity: 0;
cursor: pointer;
}
.box .bigBox {
position: absolute;
top: -1px;
left: 215px;
width: 171px;
height: 256px;
overflow: hidden;
border: 2px solid #CCC;
display: none;
}
.box .bigBox img {
position: absolute;
top: -30px;
left: -80px;
}
fdj.js
//面向对象的方式写的。
function fdj(){
this.box=$(".box");
this.smallBox=$(".box .smallBox");
this.mark=$(".box .smallBox .mark");
this.floa=$(".box .smallBox .floa")
this.bigBox=$(".box .bigBox");
this.bigPic=$(".bigBox img");
this.init();
}
//每个函数都有一个prototype属性
fdj.prototype={
init:function(){
this.overMark();
this.outerMark();
this.moveMark();
},
overMark:function(){
this.mark.mouseover($.proxy(this.handleover,this));
},
handleover:function(){
this.floa.show();
this.bigBox.show();
},
outerMark:function(){
this.mark.mouseout($.proxy(this.handleouter,this));
},
handleouter:function(){
this.floa.hide();
this.bigBox.hide();
},
moveMark:function(){
this.mark.on("mousemove",$.proxy(this.handlemove,this));
},
handlemove:function(evt){
var left=evt.pageX-this.box.offset().left-this.mark.offset().left-this.floa.outerWidth()/2;
var top=evt.pageY-this.box.offset().top-this.mark.offset().top-this.floa.outerHeight()/2;
if(left<0){
left=0;
}
else if(left>this.mark.outerWidth()-this.floa.outerWidth()){
left=this.mark.outerWidth()-this.floa.outerWidth();
}
if(top<0){
top=0;
}else if(top>this.mark.outerHeight()-this.floa.outerHeight()){
top=this.mark.outerHeight()-this.floa.outerHeight();
}
this.floa.css({left:left,top:top});
var pX=left/(this.mark.outerWidth()-this.floa.outerWidth());
var pY=top/(this.mark.outerHeight()-this.floa.outerHeight());
this.bigPic.css({
left:-pX*(this.bigPic.outerWidth()-this.bigBox.outerWidth()),
top:-pY*(this.bigPic.outerHeight()-this.bigBox.outerHeight())
});
}
}
以上是关于JQ面向对象的放大镜的主要内容，如果未能解决你的问题，请参考以下文章
前端 JavaScript 设计模式前奏--面向对象JQ实例与总结
前端 JavaScript 设计模式前奏--面向对象JQ实例与总结