可以启用“严格模式"；在 FireBug 和 Chrome 的控

时间：2023-03-04

本文介绍了可以启用“严格模式"；在 FireBug 和 Chrome 的控制台中?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

有了这个页面:

<!DOCTYPE html>
<html>
  <head>
    <script>
        "use strict";
        var foo = 2;
        delete foo;
    </script>
  </head>
  <body></body>
</html>

Firebug 控制台给出:

Firebug console gives:

applying the 'delete' operator to an unqualified name is deprecated
>>> foo
ReferenceError: foo is not defined
foo

但是这样就成功了:

>>> var bar = 2;
undefined
>>> delete bar;
true

即使您注释掉 delete foo; 以便脚本不会中断，删除 bar 仍然是成功的，尽管它是全局对象的属性"因为它是通过变量声明创建的，所以 DontDelete 属性":

Even if you comment out delete foo; so that the script does not break, deleting bar is still successful despite the fact it "is a property of a Global object as it is created via variable declaration and so has DontDelete attribute":

>>> foo
2
>>> delete foo
false
>>> var bar = 2;
undefined
>>> delete bar
true

是否可以在 FireBug 和/或 Chrome 的控制台中启用严格模式"?

Is it possible to enable "strict mode" in FireBug and or Chrome's console?

可以启用“严格模式"；在 FireBug 和 Chrome 的控

问题描述

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