lovecoding
/
VIP28


			
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							<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    #div1 {
      width: 200px;
      height: 200px;
      background: pink;
    }
  </style>
</head>

<body>
  <div id="div1"></div>
  <script>
    var div1 = document.getElementById('div1')
    //1.当前对象引用中，  谁的事件 this指向就是谁
    // div1.onclick = function(){
    //   console.log(this)
    // }

    //2.在定时器当中， this指向window
    // var timer = setInterval(function () {
    //   console.log(this)
    // }, 2000)
    // div1.onclick = function () {
    //   var timer = setInterval(function () {
    //     console.log(this)
    //   }, 2000)
    // }
    //3.在对象下面 this指向对象本身
    // var person = {
    //   name: 'zs',
    //   age: 20,
    //   eat: function(){
    //     console.log(this)
    //   }
    // }
    // person.eat()
    //4.在函数内 this指向window
    // function xx(){
    //   console.log(this)
    // }
    // xx()


    div1.onclick = function(){
      console.log(this,'a')
      var timer = setInterval(function(){
        console.log(this,'b')
      },2000)
      abc()
      
    }
    var abc = function(){
      console.log(this,'c')
    }
    console.log(this,'d')

    /* 
      div   a        d  window
      window b       a  div
      window c       c  window 
      window d       b  window
    
    */
  </script>
</body>

</html>