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 } //追加window.onload事件

1 function insertAfter(newElement,targetElement) {
2   var parent = targetElement.parentNode;
3   if (parent.lastChild == targetElement) {
4     parent.appendChild(newElement);
5   } else {
6     parent.insertBefore(newElement,targetElement.nextSibling);
7   }
8 } //在.....元素之后插入.......