getPos封装

<!DOCTYPE HTML>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>无标题文档</title>

<style>

*{ margin:0; padding:0}

div {padding: 40px 50px;}

#div1 {background: red;position: relative;}

#div2 {background: green; position: relative;}

#div3 {background: orange; position: relative;}

</style>

<script>

window.onload = function() {

    var oDiv3 = document.getElementById('div3');

    var p = getPos( oDiv3 );

    //alert( p.left );

    alert( p.top );

    function getPos(obj) {

        var pos = {left:0, top:0};//Jason

        while (obj) {

            pos.left += obj.offsetLeft;

            pos.top += obj.offsetTop;

            obj = obj.offsetParent;

        }

        return pos;

    }

}

</script>

</head>

<body id="body1">

    <div id="div1">

        <div id="div2">

            <div id="div3"></div>

        </div>

    </div>

</body>

</html>
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