/content/wiki/script-error.md
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- # Script error.
- - tags: 可排除
- ----
- | Language | Message | Browser | 备注 |
- |----------|---------------|---------------------------------|------|
- | 英文 | Script error. | Firefox, Chrome, Safari, Opera. | |
- ## 分析
- 异常信息通常如下：
- | 异常字段 | 值 |
- |----------|---------------|
- | Message | Script error. |
- | File | (空) |
- | Line | 0 |
- 1. 在某些版本的 Firefox 中，地址栏执行脚本 `javascript:notExistFunction()`
- 代码，Firebug 可以提示正确的 `"notExistFunction" is undefined`，
- 但是 onerror 异常事件处理函数中得到的错误消息却是 `Script error.`。
- 1. 用户脚本(userscript) 异常导致。
- 1. 因为同源策略，Firefox, Chrome, Safari 等浏览器，
- 页面引用的非同域的外部脚本中抛出了异常，本页面无权限获得这个异常详情，
- 所以就成了 `Script error.`。静态脚本使用独立域名未必就一定是件好事啊。
- ## 案例
- a.com/a.html
- ```html
- <script type="text/javascript">
- window.onerror = function(m,f,l){
- var s = "message:"+m+", file:"+f+", line:"+l;
- console.log(s);
- window.status = s;
- };
- </script>
- <script type="text/javascript" src="b.com/b.html"></script>
- ```
- 这里 a.com/a.html 页面引用了 b.com/b.html 脚本『注意：b.html 是一个页面』，
- 这时会抛出异常：
- | Browser | type | Message | File | Line |
- |---------|---------|------------------------------------------------------------------------------------------------------|--------------|------|
- | IE | console | 语法错误 | b.com/b.html | 1 |
- | | onerror | 语法错误 | b.com/b.html | 1 |
- | Firefox | console | syntax error | b.com/b.html | 1 |
- | | onerror | Script error. | | 0 |
- | Chrome | console | Uncaught SyntaxError: Unexpected token < | b.com/b.html | 1 |
- | | onerror | Script error. | | 0 |
- | Safari | console | | | |
- | | onerror | Script error. | | 0 |
- | Opera | console | Syntax error at line 1 while loading: expected expression, got '<'<br /><!DOCTYPE html PUBLI <br />^ | a.com/a.html | 4 |
- | | onerror | Script error. | | 0 |
- 引入外部脚本，该外部脚本会抛出异常：
- a.com/a.html
- ```html
- <script type="text/javascript">
- window.onerror = function(m,f,l){
- var s = "message:"+m+", file:"+f+", line:"+l;
- console.log(s);
- window.status = s;
- };
- </script>
- <script type="text/javascript" src="b.com/b.js"></script>
- ```
- b.com/b.js
- ```javascript
- // some comments
- // for lines.
- var a = ;
- ```
- | Browser | type | Message | File | Line |
- |---------|---------|------------------------------------------------------------------------------------------------|--------------|------|
- | IE | console | 语法错误 | b.com/b.js | 3 |
- | | onerror | 语法错误 | b.com/b.js | 3 |
- | Firefox | console | syntax error | b.com/b.js | 3 |
- | | onerror | Script error. | | 0 |
- | Chrome | console | Uncaught SyntaxError: Unexpected token ; | b.com/b.js | 3 |
- | | onerror | Script error. | | 0 |
- | Safari | console | Script error. | | 0 |
- | | onerror | Script error. | | 0 |
- | Opera | console | Syntax error at line 3 while loading: expected expression, got ';'<br/>var a = ;<br/>--------^ | a.com/a.html | 4 |
- | | onerror | Script error. | | 0 |
- 特殊的，如果是脚本中主动掷出的异常，Safari 会稍有不同。
- b.com/b.js
- ```javascript
- // some comments
- // for lines.
- throw new Error("test error on b.");
- ```
- | Browser | type | Message | File | Line |
- |---------|---------|---------------------------------------------|--------------|------|
- | IE | console | test error on b. | b.com/b.js | 3 |
- | | onerror | test error on b. | b.com/b.js | 3 |
- | Firefox | console | test error on b. | b.com/b.js | 3 |
- | | onerror | Script error. | | 0 |
- | Chrome | console | Uncaught Error: test error on b. | b.com/b.js | 3 |
- | | onerror | Script error. | | 0 |
- | Safari | console | Error: test error on b. | | |
- | | onerror | undefined | | 0 |
- | Opera | console | Uncaught exception: Error: test error on b. | a.com/a.html | 4 |
- | | onerror | Script error. | | 0 |
- ## 参考
- * [Cryptic “Script Error.” reported in Javascript in Chrome and Firefox](http://stackoverflow.com/questions/5913978/cryptic-script-error-reported-in-javascript-in-chrome-and-firefox)
- * [WebKit source that checks origin](http://trac.webkit.org/browser/branches/chromium/648/Source/WebCore/dom/ScriptExecutionContext.cpp?rev=77122#L301)
- * [Firefox source that checks](http://mxr.mozilla.org/mozilla-beta/source/dom/base/nsJSEnvironment.cpp#316)
- * [Same origin policy](http://en.wikipedia.org/wiki/Same_origin_policy)