RedYin的网络漂流记

起因：业务管理系统中需要用PHP 的 urlencode 编码一段字符串，然后用js解码。

经过：在网上找到两种比较流行的方法，一种是：VBScript+js，另外是纯js但是需要大段转码库。共同点就是都很麻烦，最重要的是经我测试都是不能用的，不知道是不是我没用对。最后在这里找到一种超级简单且有效的方法：

  JavaScript urldecode
 Decodes URL-encoded string

function urldecode (str) {
    // Decodes URL-encoded string
    //
    // version: 1107.2516
    // discuss at: http://phpjs.org/functions/urldecode
    // +   original by: Philip Peterson
    // +   improved by: Kevin van Zonneveld(http://kevin.vanzonneveld.net)
    // +      input by: AJ
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Brett Zamir (http://brett-zamir.me)
    // +      input by: travc
    // +      input by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Lars Fischer
    // +      input by: Ratheous    // +   improved by: Orlando
    // +      reimplemented by: Brett Zamir (http://brett-zamir.me)
    // +      bugfixed by: Rob
    // +      input by: e-mike
    // +   improved by: Brett Zamir (http://brett-zamir.me)
    // %        note 1: info on what encoding functions to use from:
    //    http://xkr.us/articles/javascript/encode-compare/
    // %        note 2: Please be aware that this function expects to decode from UTF-8 encoded strings, as found on
    // %        note 2: pages served as UTF-8
    // *     example 1: urldecode('Kevin+van+Zonneveld%21');
    // *     returns 1: 'Kevin van Zonneveld!'    // *     example 2: urldecode('http%3A%2F%2Fkevin.vanzonneveld.net%2F');
    // *     returns 2: 'http://kevin.vanzonneveld.net/'
    // *     example 3: urldecode('http%3A%2F%2Fwww.google.nl%2Fsearch%3Fq%3Dphp.js%26ie%3Dutf-8%26oe%3Dutf-8%26aq%3Dt%26rls%3Dcom.ubuntu%3Aen-US%3Aunofficial%26client%3Dfirefox-a');
    // *     returns 3: 'http://www.google.nl/search?q=php.js&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a'
    return decodeURIComponent((str + '').replace(/\+/g, '%20'));}

 注释有一大堆，代码只有一行，呵呵。