JavaScript search()无法找到“()". [英] JavaScript search() fails to find "()"

问题描述

这看似微不足道，但我是JS的新手.我有这段代码:

This might seem trivial, but I'm new to JS. I have this piece of code:

alert(elementAction);    
var argumentsBegin = elementAction.search("(");
var argumentsEnd = elementAction.search(")");
alert(argumentsBegin);

elementAction 是一个字符串.代码的问题在于它似乎没有找到括号.例如，第一个警报框显示:外部(内部)但是第二个根本没有出现.不过，如果我将{)替换为{}，一切都很棒.有什么想法为什么对我不起作用?

elementAction is a string. The problem with the code is it doesn't seem to find the parenthesis. The first alert box shows for example: outer(inner) But the second one doesn't appear at all. All is cool if I replace () with {}, though. Any thoughts why is this not working for me?

推荐答案

是的:字符串的 search()方法期望使用正则表达式作为参数，并将您要传递的字符串作为正则表达式模式，其中括号具有特殊含义.使用 indexOf()代替:

Yes: the search() method of strings expects a regular expression as the parameter and is treating the string you're passing as a regular expression pattern, in which parentheses have special meaning. Use indexOf() instead:

alert( elementAction.indexOf("(") ); 

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