Javascript使用严格的错误没有捕获 [英] Javascript use strict error not catching

问题描述

我正在创建一个使用require.js for AMD的backbone.js应用程序。为了在浏览器中检查使用严格支持，我已经包含以下代码。但是，当代码运行时， var o = {p：1，P：2} 引发的错误不会像我预期的那样被捕获，而是会被杀死整个页面。

I am creating a backbone.js app that uses require.js for AMD. In order to check for use strict support in the browser, I have included the following code. However, when the code is run, the error thrown by var o = {p:1, P:2} is not caught as I expect it to be, and instead kills the entire page.

Chrome控制台打印此错误： 未捕获的SyntaxError：严格模式下不允许在对象文字中复制数据属性

Chrome console prints this error: Uncaught SyntaxError: Duplicate data property in object literal not allowed in strict mode

require([
    'jquery',
    'underscore',
    'backbone',
    'src/app'
], function(jQuery, _, Backbone, App){
    "use strict"

    var tooOld = true,
    isStrictMode = function () {
        try{
            var o = {p:1, p:2};
        } catch (e) {
            tooOld = false;
            new App;
        } finally {
            if (tooOld) {
                // Display some message
            }
        }
    }();
});

为什么错误导致我的页面崩溃而不是被抓住？我该如何解决这个问题？

Why is the error crash my page instead of being caught? How can I fix this?

推荐答案

如果您想检查严格模式支持，请考虑：

If you want to check for strict mode support, consider:

function supportsStrict() {
  'use strict';
  return typeof function(){return this;}() == 'undefined';
}

console.log(supportsStrict()); // true if supports strict mode

这样您可以独立测试并运行不同的代码分支，具体取决于结果。

That way you can test independently and run different code branches depending on the result.

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