我可以在 Javascript 中抛出异常，从而停止 Javascript 执行吗？
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Can I throw an exception in Javascript, that stops Javascript execution?
提问by Mathias F
I try to simulate a problem where a script that is loaded from an external url stops execution of any more scripts on my site.
我尝试模拟一个问题，即从外部 url 加载的脚本停止在我的站点上执行任何更多脚本。
I tried to simulate such a problem by calling a function that does not exits. I can see the error in firebug but different scripts on the page are still executed.
我试图通过调用一个不退出的函数来模拟这样的问题。我可以在 firebug 中看到错误，但页面上的不同脚本仍在执行。
Are there different kinds of errors in Javascripts? If yes: what kind of error stops script execution? I only need this answer for Firefox.
Javascript 中是否存在不同类型的错误？如果是：什么样的错误会停止脚本执行？我只需要 Firefox 的这个答案。
EDIT
编辑
This question is easy to misunderstood but Rob W got it: I need to throw an exception and that exception needs to stop further script execution.
这个问题很容易被误解，但 Rob W 明白了：我需要抛出一个异常并且该异常需要停止进一步的脚本执行。
回答by Rob W
Answer to the title: No
Answer to "Are there different kinds of errors in JavaScript**: Yes, see MDN: Error
Syntax errors will prevent a whole script block from being executed, other errors (TypeErrors, Reference errors) will only stop the execution after the occurrence of the error.
对标题的 回答：No
Answer to "Are there different types of errors in JavaScript**: Yes, see MDN: Error
Syntax 错误将阻止整个脚本块被执行，其他错误（TypeErrors、Reference 错误）只会停止执行错误发生后执行。
Different <script>blocks are executed separately. You cannot prevent the second block from execution by throwing an error in the first block (Demo: http://jsfiddle.net/WJCEN/).
不同的<script>块分别执行。您不能通过在第一个块中抛出错误来阻止第二个块的执行（演示：http: //jsfiddle.net/WJCEN/）。
<script>Example: Syntax error in this script.</script>
<script>console.log('Still executed.')</script>
Also, if an error is caught using try-catch(demo: http://jsfiddle.net/WJCEN/1/), then the error will not even stop the execution a whole block.
此外，如果使用try-catch(demo: http://jsfiddle.net/WJCEN/1/)捕获错误，则该错误甚至不会停止整个块的执行。
try {throw 'Code';}catch(e){}
console.log('Still executed');
没有通用的万能方法可以阻止所有代码运行。对于单个脚本，您可以使用一些技巧来阻止代码进一步运行。
Example 1 (demo): Temporary overwrite a method
示例 1（演示）：临时覆盖一个方法
1: <script>window._alert = alert;alert=null;</script>
2: <script>alert('Some code!');confirm('Not executing');</script>
3: <script>alert=_alert;delete window._alert;alert('Done!');</script>
This method is based on the fact that script 2 expects alertto be a function. We have rewritten alertto a non-function property (script 1). Script 2 throws a TypeError, and the second block is skipped.
We restore the original values in script 3.
该方法基于脚本 2 期望alert是函数这一事实。我们已重写alert为非函数属性（脚本 1）。脚本 2 抛出 a TypeError，并跳过第二个块。
我们恢复了脚本 3 中的原始值。
Example 2 (demo): Define a constant method, which cannot be overwritten.
示例 2（演示）：定义一个常量方法，该方法不能被覆盖。
4. <script>Object.defineProperty(window, 'test',{value:null});</script>
5. <script>var test=function(){alert('Test');};test();alert('What?');</script>
This methods relies on the Object.definePropertymethod, to effectively define a constant value. In strict mode, the var testdeclaration would throw a TypeError: "test is read-only".
When strict mode is not enables, a TypeError will be thrown at test(): "test is not a function" (because we defined testto be constant, in script 4).
这个方法依赖于Object.defineProperty方法，来有效地定义一个常量值。在严格模式下，var test声明会抛出 TypeError: "test is read-only"。
当严格模式未启用时，将在以下位置抛出 TypeError test()：“test is not a function”（因为我们test在脚本 4 中定义为常量）。
Note: The last method is not working correctly with function declarations (see bug #115452, Chrome 17)
注意：最后一种方法在函数声明中不能正常工作（参见错误 #115452，Chrome 17）
回答by Mouna Cheikhna
you can use the error object which support the following two properties:
您可以使用支持以下两个属性的错误对象：
name: The name of the error.
message: A description of the error.
for example to stop execution you can use : throw new Error("myError");
例如，要停止执行，您可以使用： throw new Error("myError");
Are there different kinds of errors in Javascripts?
Javascript 中是否存在不同类型的错误？
Besides the generic Error constructor, there are six other core errors in JavaScript:
除了通用的 Error 构造函数之外，JavaScript 中还有其他六个核心错误：
see heredetails on these errors.
请在此处查看有关这些错误的详细信息。
回答by Kunal Vashist
Use
try catch finally block
利用
try catch finally block
It will do the trick
它会做的伎俩
