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var odiv = document.getElementById("div_1"); var sTop = document.documentElement.scrollTop || document.body.scrollTop; var cHeight= document.documentElement.clientHeight || document.body.clientHeight; var mid = (cHeight - odiv.offsetHeight) / 2; // odiv.style.top = parseInt(sTop + mid) + "px"; //理论上应该只设这句就可以居中吧 //实际上的 各大浏览器只认识下面这if判断 if(navigator.appVersion.indexOf("MSIE 6")> -1){ odiv.style.top = parseInt(sTop + mid) + "px"; }else{ odiv.style.top =mid + "px"; } }