Javascript：window.onload 加載多組 Function

function addLoadEvent(func)
{
	var oldonload = window.onload;
	if(typeof window.onload != 'function')
	{
		window.onload = func;
	}else{
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

function A(){}
function B(){}
function C(){}

addLoadEvent(A);
addLoadEvent(B);
addLoadEvent(C);