lovecoding
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VIP30


			
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<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>
</head>

<body>
  <script>
    //基本数据类型：number string boolean undefined null
    //引用数据类型：object

    // var a = 4
    // b = a
    // b = 10
    // console.log(a)
    // console.log(b)


    // var a = [1,2,3,4]
    // b = a
    // b[0] = 999
    // console.log(a)
    // console.log(b)

    // var a = {
    //   name: 'zs',
    //   age: 30
    // }
    // b = a
    // b.name = 'peiqi'
    // console.log(a)
    // console.log(b)

    var b = 3
    var c = {
      name: 'xiaohong'
    }
    function num() {
      console.log(b)
      var b = 11
      console.log(b)
      console.log(c.name)
      c.name = 'lisi'
      console.log(c.name)
      b = 12
    }
    console.log(b)
    num()
    console.log(b)

    //3 undefined  11 xiaohong  lisi  3
  </script>
</body>

</html>