javascript onload行列

 1 function addLoadEvent(func){

 2         var oldonload = window.onload;

 3         if (typeof window.onload != 'function') {

 4             window.onload = func;

 5         } else {

 6             window.onload = function(){

 7                 oldonload();

 8                 func();

 9             };

10         }

11     }