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dom 优酷得弹出

<!doctype html><html><head><meta charset="utf-8"><title>无标题文档</title><style>body{    margin:0px;    }#wrap{    background:black;    opacity:0.3;    filter:alpha(apacity=30);    position:absolute;    left:0px;    top:0px;    display:none;    }#box{    width:300px;    height:200px;    padding:10px;    background:white;    border:5px solid #333;    position:absolute;    display:none;    }#close{     position:absolute;     right: 5px;     top: 5px;     text-decoration: none;     color: black;    }    #close:hover {    background: #333;     color: white;    }            </style><script type="text/javascript">window.onload = function (){    var obtn = document.getElementsByTagName(‘input‘)[0];    var owrap = document.getElementById(‘wrap‘);    var obox = document.getElementById(‘box‘);    var oa = document.getElementById(‘close‘);        oa.onclick = function ()    {        owrap.style.display = ‘none‘;        obox.style.display = ‘none‘;    }        obtn.onclick = function ()    {                var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;        var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;                owrap.style.display = ‘block‘;                        owrap.style.width = Math.max(document.documentElement.clientWidth,document.body.offsetWidth) + ‘px‘;        owrap.style.height = Math.max(document.documentElement.clientHeight,document.body.offsetHeight) + ‘px‘;            obox.style.display = ‘block‘;                obox.style.left = (document.documentElement.clientWidth - obox.offsetWidth )/2 + scrollLeft + ‘px‘;         obox.style.top = (document.documentElement.clientHeight - obox.offsetHeight )/2 + scrollTop + ‘px‘;             };        window.onscroll = function ()    {        if(obox.style.display == ‘none‘) return;                var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;        var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;                obox.style.left = (document.documentElement.clientWidth - obox.offsetWidth )/2 + scrollLeft + ‘px‘;         obox.style.top = (document.documentElement.clientHeight - obox.offsetHeight )/2 + scrollTop + ‘px‘;     };        window.onresize = function ()    {        if(obox.style.display == ‘none‘) return;        var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;        var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;        owrap.style.width = Math.max(document.documentElement.clientWidth,document.body.offsetWidth) + ‘px‘;        owrap.style.height = Math.max(document.documentElement.clientHeight,document.body.offsetHeight) + ‘px‘;                    obox.style.left = (document.documentElement.clientWidth - obox.offsetWidth )/2 + scrollLeft + ‘px‘;         obox.style.top = (document.documentElement.clientHeight - obox.offsetHeight )/2 + scrollTop + ‘px‘;    };}</script></head><body style="height:2000px;">    <input type="button" value="http://www.mamicode.com/登陆">    <div id="wrap"></div>    <div id="box">        <a href="javascript:;" id="close">x</a>            这里是登陆的表单等内容    </div>    <div></body></html>

 

dom 优酷得弹出