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

????????? func();
????? }

?? }

}

function func1(){alert("aaa");}

function func2(){alert("bbb");}

addLoadEvent(func1);

addLoadEvent(func2);

?

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?

当然jquery也可以实现。