lovecoding
/
web0331


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        /**
         * const 特点：
         *   1.var具备变量提升 const不具备变量提升
         *   2.const常用于声明常量
         *   3.变量首字母大写
         *   4.const赋值的变量 一般不做修改
         *   5.不可以重复声明
        */
    //    console.log(a);
       const a = 3.1415926;

       const Vase = 12;
       Vase = 22;
      const a = 12;
       console.log(a)
    </script>
</body>
</html>