console 命令行工具 X clear

console

function bind(ele,name,callback){
  if(ele.addEventListener){
    ele.addEventListener(name,callback,false)
  }else{
    ele.attachEvent('on' + name,function(){
      callback.call(ele)
    })
  }
}

var oDemo = document.getElementsByClassName('demo')[0]

bind(oDemo,'click',function(){
  alert(123)
})

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>封装兼容的绑定事件方法</title>
</head>
<body>
  
  <div class="demo"></div>
  
</body>
</html>

.demo{
  width: 100px;
  height: 100px;
  background: #f40;
}