front-end-77
/
21-面试题-let-const-var.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1.0,maximum-scale=1,minimum-scale=1,user-scalable=no"
    />
    <title>21-面试题-let-const-var.html</title>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
    </style>
  </head>
  <body>
    <script>
      // console.log(abc);
      // var abc = 123;

      // var abc;
      // // console.log(abc);
      // abc = 123;
      // if(true){
      //   let a=123;
      // }
      // console.log(a);

      let a = 123;
      let a = 456;
      console.log(a);
    </script>
  </body>
</html>