How to Catch Unhandled Javascript Errors(如何捕获未处理的Javascript错误)
Assign the window.onerror event to an event handler like:
(将window.onerror事件分配给事件处理程序，如：)
<script type="text/javascript">
window.onerror = function(msg, url, line, col, error) {
// Note that col & error are new to the HTML 5 spec and may not be
// supported in every browser. It worked for me in Chrome.
var extra = !col ? '' : '
column: ' + col;
extra += !error ? '' : '
error: ' + error;
// You can view the information in an alert to see things working like this:
alert("Error: " + msg + "
url: " + url + "
line: " + line + extra);
// TODO: Report this error via ajax so you can keep track
// of what pages have JS issues
var suppressErrorAlert = true;
// If you return true, then error alerts (like in older versions of
// Internet Explorer) will be suppressed.
return suppressErrorAlert;
};
</script>
As commented in the code, if the return value of window.onerror is true then the browser should suppress showing an alert dialog.
(如代码中所述，如果window.onerror的返回值为true则浏览器应禁止显示警告对话框。)
When does the window.onerror Event Fire?(window.onerror什么时候发生火灾？)
In a nutshell, the event is raised when either 1.) there is an uncaught exception or 2.) a compile time error occurs.
(简而言之，当1.）存在未捕获的异常或2.）发生编译时错误时引发该事件。)
uncaught exceptions
(没有被捕的例外)
compile error
(编译错误)
-
<script>{</script>
-
<script>for(;)</script>
-
<script>"oops</script>
-
setTimeout("{", 10); , it will attempt to compile the first argument as a script(，它将尝试将第一个参数编译为脚本)
Browsers supporting window.onerror(浏览器支持window.onerror)
- Chrome 13+
(Chrome 13+)
- Firefox 6.0+
(Firefox 6.0+)
- Internet Explorer 5.5+
(Internet Explorer 5.5+)
- Opera 11.60+
(Opera 11.60+)
- Safari 5.1+
(Safari 5.1+)
Screenshot:(截图：)
Example of the onerror code above in action after adding this to a test page:
(将此添加到测试页面后，上面的onerror代码示例：)
<script type="text/javascript">
call_something_undefined();
</script>
JSFiddle:(的jsfiddle：)
https://jsfiddle.net/nzfvm44d/
(https://jsfiddle.net/nzfvm44d/)
References:(参考文献：)
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