JavaScript attachEvent 用法详解与事件执行顺序

obj.onclick=method1
obj.onclick=method2
obj.onclick=method3

btn1Obj.attachEvent("onclick",method1);
btn1Obj.attachEvent("onclick",method2);
btn1Obj.attachEvent("onclick",method3);

btn1Obj.addEventListener("click",method1,false);
btn1Obj.addEventListener("click",method2,false);
btn1Obj.addEventListener("click",method3,false);

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>attachEvent</title>
<script type="text/javascript">
//第一种方式(微软的私人方法)
function iniEvent() {
  var btn = document.getElementById("btn");
  btn.attachEvent("onclick", click1);
  btn.attachEvent("onclick", click2);
  btn.attachEvent("onclick", click3);
}
//第二种方式(火狐和其他浏览器)
function iniEvent2() {
  var btn = document.getElementById("btn");
  btn.addEventListener("click", click1, false);
  btn.addEventListener("click", click2, false);
  btn.addEventListener("click", click3, false);
}
function click1() {
  alert('click1');
}
function click2() {
  alert('click2');
}
function click3() {
  alert('click3');
}
</script>
</head>
<body onload="iniEvent()">
<input type="button" id="btn" value="attachEvent" />
</body>
</html>