Comment mettre en œuvre un exemple de loupe Taobao-js tutoriel-php.cn

Comment mettre en œuvre un exemple de loupe Taobao

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Libérer： 2017-09-26 10:25:23

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<!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>

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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;;
}

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