JavaScript DOM编程艺术笔记

1.addLoadEvent函数：

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

addLoadEvent(firstfunction)

2.insertAfter函数：

function insertAfter(newElement,targetElement){
var parent=targetElement.parentNode;
if(parent.lastChild==targetElement){
parent.appendChild(newElement);
}
else{
parent.insertBefore(newElement,targetElement.nextSibling);
}
}