lovecoding
/
vipAllDay


			
				
					
						
						
							123456789101112131415161718192021222324252627282930
							<!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>
      /**
       * let 定义变量
       * 1.不能重复声明变量
       * 2.不具备变量提升
       * 3.具备块级作用域
       */
      // let a = 1;
      // let a = 2;
      // var a = 1;
      // var a = 2;
      // console.log(a);
    //   console.log(b);
    //   let b = 1;
    //   console.log(b);
      console.log(c);
      function fn1() {
        var c = 1;
      }
    </script>
  </body>
</html>