chuck
/
es6-11study


			
				
					
						
						
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							<!DOCTYPE html>
<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>
        //声明变量 不能重复
        let a;
        let b,c,d;
        let e = 100;
        let f = 521,g = 'hi', h = {};

        //块级作用域
        // if else while for
        //{
        //    let a = 'c';
        //}

        //不存在变量提升
        //console.log(hello);
        //let hello = 'a';

        //不影响作用域链
        {
            let school = 'hi';
            function aa(){
                console.log(school)
            }
            aa();
        }
    </script>
</body>
</html>