GetStyle (obj, attr) compatible with get CSS

The value of the CSS property of the set element can be used with the style property of elements, where the dom.style.attr is mostly undefined;

Dom.style.attr is used to get the inline style, and now the page is basically an outer chain style sheet so that the value is not obtained; so it can only be undefined;

How do you get it, or set its style? There is a GetStyle () method below:

<script>
function GetStyle (obj, attr)
{
if (Obj.currentstyle)
{
return obj.currentstyle[attr];
}
Else
{
Return getComputedStyle (Obj,false) [attr];
}
}
Window.onload=function () {
var Aaa=document.getelementbyid ("DIV1");
Alert (GetStyle (DIV1, ' width '))
}
</script>

This will be available at the time of acquisition.

GetStyle (obj, attr) compatible with get CSS