通用于ie和firefox的函数GetCurrentStyle(obj,prop)_javascript技巧

function GetCurrentStyle (obj, prop) {
if (obj.currentStyle) {
return obj.currentStyle[prop];
}
else if (window.getComputedStyle) {
prop = prop.replace (/([A-Z])/g, "-$1");
prop = prop.toLowerCase ();
return window.getComputedStyle (obj, "").getPropertyValue(prop);
}
return null;
}