日期:2014-05-17 浏览次数:20778 次
<!DOCTYPE HTML>
<html>
    <head>
        <meta charset="gb2312" />
        <title></title>
        <style>
            #wraps{
                margin:0px auto; width:960px;
                border:1px solid red;
                position:relative; left:0; top:0;
            }
        </style>
    </head>
    <body>
        <div id="wraps">123</div>
        <button id="btn">body长高了,div会移动吗?</button>
        <script>
            var $ = function(id){
                return document.getElementById(id);
            };
            var $t = function(tag, cot){
                cot = cot || document;
                return cot.getElementsByTagName(tag);
            };
            var a = document.body.offsetWidth;
            $('btn').onclick = function(){
                $t('body')[0].style.height = '2000px';
                var b = document.body.offsetWidth;
                var t = a - b;
                //console.log(t)
                if( t ){
                    $('wraps').style.left = t/2+'px';
                }
                
            }
        </script>        
    </body>
</html>
------解决方案--------------------
5楼的,如果切换浏览器窗口大小呢?最大化,还原……