8.语句.html 478 B

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  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4. <meta charset="UTF-8">
  5. <meta name="viewport" content="width=device-width, initial-scale=1.0">
  6. <title>Document</title>
  7. </head>
  8. <body>
  9. <script>
  10. // 全局作用域
  11. var a=10;
  12. // 5>4 表达式
  13. function fn() {
  14. // {} 代码块
  15. // 局部作用域
  16. var b=2;
  17. console.log(a,b);
  18. }
  19. fn();
  20. console.log(b)
  21. </script>
  22. </body>
  23. </html>