Javascript 尝试/捕获 [英] Javascript Try/Catch
问题描述
我有一个运行用户生成的正则表达式的函数.但是，如果用户输入一个不会运行的正则表达式，它就会停止并跌倒.我试过将这条线包裹在 Try/Catch 块中，但没有任何反应.
I've got a function that runs a user generated Regex. However, if the user enters a regex that won't run then it stops and falls over. I've tried wrapping the line in a Try/Catch block but alas nothing happens.
如果有帮助，我正在运行 jQuery，但下面的代码没有它，因为我猜它比那更基本一点.
If it helps, I'm running jQuery but the code below does not have it as I'm guessing that it's a little more fundamental than that.
是的，我知道我不是在逃避["，这是故意的，也是问题的重点.我正在接受用户输入，我想找到一种方法来解决此类问题，而不会让应用程序崩溃.
Yes, I know that I am not escaping the "[", that's intentional and the point of the question. I'm accepting user input and I want to find a way to catch this sort of problem without the application falling flat on it's face.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>Regex</title>
<script type="text/javascript" charset="utf-8">
var grep = new RegExp('gr[');
try
{
var results = grep.exec('bob went to town');
}
catch (e)
{
//Do nothing?
}
alert('If you can see this then the script kept going');
</script>
</head>
<body>
</body>
</html>
推荐答案
试试这个新的 RegExp 抛出异常
Try this the new RegExp is throwing the exception
正则表达式
<script type="text/javascript" charset="utf-8">
var grep;
try {
grep = new RegExp("gr[");
}
catch(e) {
alert(e);
}
try
{
var results = grep.exec('bob went to town');
}
catch (e)
{
//Do nothing?
}
alert('If you can see this then the script kept going');
</script>
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