learn-jQuery-sourceCode-node/addEventListener.html at master · YanZiSen/learn-jQuery-sourceCode-node · GitHub

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<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title>事件函数仿写</title>
  <script>
    (function () {
      /*function add(obj, event, callback) {
        obj.dataset[event] = obj.dataset[event] || [];
        console.log(typeof obj.dataset[event]);
        obj.dataset[event].push(callback);
        console.log(obj.dataset[event]);
        obj.addEventListener(event, callback, false);
      }*/
      function add(obj,types,fn){
        obj.listener=obj.listener||{};
        obj.listener[types]=obj.listener[types]||[];
        obj.listener[types].push(fn);
      };
      function remove(obj,types,fn) {
        obj.removeEventListener(types,fn, false);
        delete obj.listener[types];
      }

      function trigger(obj, types) {
        var arr=obj.listener[types]||[];
        for(var i=0;i<arr.length;i++){
          arr[i]();
        }
      }

      window.onload = function () {
        var div=document.getElementsByTagName('div')[0];
        add(div,'click',function(){
          alert(1);
        });
        add(div,'click',function(){
          alert(2);
        });
        remove(div,'click');
//        trigger(div,'click');
      }
    })();
  </script>
  <style>
    div{
      width:300px;height:300px;background-color:#afa;
    }
  </style>
  <script src='2.0.3/jquery-2.0.3.js'></script>
  <script>
    $(function(){
      $('#d').on('click',function(){
        alert(1);
      });
      $('#d1').on('click',function(){
        alert(2);
      });
      $('#d1').on('mouseover','span',function(){
        console.log(3);
      });
    });
  </script>
</head>
<body>
<div>1</div>
<div>2</div>
<div id="d1">
  <span>span</span>
</div>
</body>
</html>