lovecoding
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VIP22


			
				
					
						
						
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<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>
    /* 
      const
      1、不能重复声明
      2、没有变量提升
      3、临时失效区
      4、块级作用域
    */
    // const a = 100;
    // console.log(a)
    
    // const a = 100
    // a = 200 
    // console.log(a)

    // console.log(a)
    // const a = 100

    // const a = 100
    // function fn(){
    //   console.log(a)
    //   const a = 10
    // }
    // fn()
      var a = true
    if(a){
      const x = 100
    }
    console.log(x)
  </script>
</body>
</html>