从字符串的开头和结尾修剪空格

问题描述

我正试图找到一种方法来从标题字符串的开头和结尾修剪空格。我正在使用它，但它似乎不起作用：

I am trying to find a way to trim spaces from the start and end of the title string. I was using this, but it doesn't seem to be working:

title = title.replace(/(^[\s]+|[\s]+$)/g, '');

任何想法？

推荐答案

注意：截至2015年，。这意味着对于大多数用例而言，只需执行 str.trim（）就可以实现问题所要求的最佳方式。

Note: As of 2015, all major browsers (including IE>=9) support String.prototype.trim(). This means that for most use cases simply doing str.trim() is the best way of achieving what the question asks.

Steven Levithan在Javascript中分析了许多不同的 trim 实现性能条款。

Steven Levithan analyzed many different implementation of trim in Javascript in terms of performance.

他的推荐是：

function trim1 (str) {
    return str.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
}

用于快速跨浏览器的通用实现，以及

for "general-purpose implementation which is fast cross-browser", and

function trim11 (str) {
    str = str.replace(/^\s+/, '');
    for (var i = str.length - 1; i >= 0; i--) {
        if (/\S/.test(str.charAt(i))) {
            str = str.substring(0, i + 1);
            break;
        }
    }
    return str;
}

如果你想在所有浏览器中异常快速地处理长字符串。

"if you want to handle long strings exceptionally fast in all browsers".

• blog.stevenlevithan.com -- Faster JavaScript Trim

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