lovecoding
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VIP24


			
				
					
						
						
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  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
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<body>
  <script>
    /* 
    const  和  var的区别
    1.const 不能重复声明
    2.不能重复赋值
    3.没有变量提升
    4.临时失效区
    5.const  块级作用域
    */
    // 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 = 10
    }
    console.log(x)
  </script>
</body>
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