js 图片延时加载

时间：2023-03-14 22:17:26
<!doctype html>

<html>

<head>

<meta charset="utf-8">

<meta name="author" content="智能社 - zhinengshe.com">

<meta name="copyright" content="智能社 - zhinengshe.com">

<title>智能社 - www.zhinengshe.com</title>

<style>

* { margin:; padding:; }

li { float:left; width:310px; height:310px; border:1px solid red; list-style:none; margin:5px; }

</style>

<script>

window.onload=window.onresize=window.onscroll=function (){

    var aImg=document.getElementsByTagName('img');

    var scrollTop=document.documentElement.scrollTop || document.body.scrollTop;

    var scrollBottom=document.documentElement.clientHeight+scrollTop;//可是区域高度+滚动高度

    for (var i=; i<aImg.length; i++)

    {

        var top=getPos(aImg[i]).top;

        if (top<scrollBottom)

        {

            // 图片在可视区内

            aImg[i].src=aImg[i].getAttribute('_src');

        }

    }

};

function getPos(obj){

    var l= ;

    var t= ;

    while(obj){

        l += obj.offseLeft;

        t += obj.offsetTop;

        obj = obj.offseParent;

    }

    return {left:l,top:t};

}

</script>

</head>

<body>

    <ul>

        <li><img _src="data:images/m1.jpg" /></li>

        <li><img _src="data:images/m2.jpg" /></li>

        <li><img _src="data:images/m3.jpg" /></li>

        <li><img _src="data:images/m4.jpg" /></li>

        <li><img _src="data:images/m5.jpg" /></li>

        <li><img _src="data:images/m6.jpg" /></li>

        <li><img _src="data:images/m7.jpg" /></li>

        <li><img _src="data:images/m8.jpg" /></li>

        <li><img _src="data:images/m9.jpg" /></li>

        <li><img _src="data:images/m10.jpg" /></li>

    </ul>

</body>

</html>

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