lovecoding
/
vipAllDay


			
				
					
						
						
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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
         * 1.一般用于定义常量
         * 2.不具备变量提升
         * 3.不能重复声明
         * 4.几乎不常修改
        */
        // console.log(PI);
        const PI ='3.14';
        // const PI = 
        console.log(PI);
    </script>
</body>
</html>