Simple absolute positioning and centering sample code for JS pop-up layer_javascript skills

复制代码 代码如下:

function doThis()
{
var a = document.getElementById("addYear");
a.style.left=(document.body.clientWidth/2-a.clientWidth/2) "px";
a.style.top=(document.body.scrollTop document.body.clientHeight/2-a.clientHeight/2) "px";
}