Home > Article > Web Front-end > How to implement Taobao magnifying glass example

How to implement Taobao magnifying glass example

一个新手Original: 2017-09-26 10:25:231100browse

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>放大镜</title>
 <link rel="stylesheet" type="text/css" href="style/css.css">
</head>
<script type="text/javascript">
	
</script>
<body>

<p id="p1">

    <p class="small_pic">
		<span class="mark"></span>
        <span class="float_layer"></span>
        <img src="images/b.jpg" alt="" longdesc="" />
    </p>

    <p class="big_pic">
		<img src="images/a.jpg" alt=""longdesc="" />
	</p>

</p>

</body>
<script src="./js/js.js"></script>	
</html>

function getByClass(oParent,sClass){
	var aEle=oParent.getElementsByTagName(&#39;*&#39;);
	var aTmp=[];
	var i=0;
	for(i=0;i<aEle.length;i++){
		if(aEle[i].className==sClass){
			aTmp.push(aEle[i]);
		}
	}
	return aTmp;

}
var op = document.getElementById(&#39;p1&#39;);
var oMark = getByClass(op,&#39;mark&#39;)[0];
var oFloat=getByClass(op,&#39;float_layer&#39;)[0];
var oBg=getByClass(op,&#39;big_pic&#39;)[0];
var oSm=getByClass(op,&#39;small_pic&#39;)[0];
var oImg=oBg.getElementsByTagName(&#39;img&#39;)[0];
oMark.onmouseover=function(){
	oFloat.style.display=&#39;block&#39;;
    oBg.style.display=&#39;block&#39;;
}
oMark.onmouseout=function(){
	oFloat.style.display=&#39;none&#39;;
	oBg.style.display=&#39;none&#39;;
}	
oMark.onmousemove=function(ev){
    var oEvent=ev||event;
    var disX=oEvent.clientX-op.offsetLeft-oSm.offsetLeft-oFloat.offsetWidth/2;
    var disY=oEvent.clientY-op.offsetTop-oSm.offsetTop-oFloat.offsetHeight/2;
    var l=disX, t=disY;
    l<0?l=0:l>(oMark.offsetWidth-oFloat.offsetWidth)?l=oMark.offsetWidth-oFloat.offsetWidth:l=disX;
    t<0?t=0:t>(oMark.offsetWidth-oFloat.offsetHeight)?t=oMark.offsetWidth-oFloat.offsetHeight:t=disY;
    // if(l<0){
    // 	l=0;
    // }else if(l>oMark.offsetWidth-oFloat.offsetWidth){
    // 	l=oMark.offsetWidth-oFloat.offsetWidth;
    // }
    // if(t<0){
    // 	t=0;
    // }else if(t>oMark.offsetWidth-oFloat.offsetHeight){
    // 	t=oMark.offsetWidth-oFloat.offsetHeight;
    // }
    oFloat.style.left=l+&#39;px&#39;;
    oFloat.style.top=t+&#39;px&#39;;
    var percentX=l/(oMark.offsetWidth-oFloat.offsetWidth);
    var percentY=t/(oMark.offsetHeight-oFloat.offsetHeight);
    oImg.style.left=-(oImg.offsetWidth-oBg.offsetWidth)*percentX +&#39;px&#39;;
  	oImg.style.top=-(oImg.offsetHeight-oBg.offsetHeight)*percentY +&#39;px&#39;;
}

The above is the detailed content of How to implement Taobao magnifying glass example. For more information, please follow other related articles on the PHP Chinese website!

Statement：

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Previous article：How to develop and implement a simple snake game using jsNext article：How to develop and implement a simple snake game using js

See more

How to implement Taobao magnifying glass example

Related articles