很多朋友说JavaScript的decodeURI函数也可以实现，但有bug所有呢，下面看下下面的函数，经过测试使用暂时没什么问题，我在之前的文章说过，这个和php的urldecode函数根本不是一回事。下面是我根据高人的代码改写的JavaScript版的urldecode函数，参考的链接在开头提到的文章中有，就不一一列举了。和之前的urlencode函数一样，只实现了utf-8版的。

1、urlencode

使用方法： urlencode(str);

function urlencode(clearString) { var output = ''; var x = 0; clearString = utf16to8(clearString.toString()); var regex = /(^[a-zA-Z0-9-_.]*)/; while (x < clearString.length) { var match = regex.exec(clearString.substr(x)); if (match != null && match.length > 1 && match[1] != '') { output += match[1]; x += match[1].length; } else { if (clearString[x] == ' ') output += '+'; else { var charCode = clearString.charCodeAt(x); var hexVal = charCode.toString(16); output += '%' + ( hexVal.length < 2 ? '0' : '' ) + hexVal.toUpperCase(); } x++; } } function utf16to8(str) { var out, i, len, c; out = ""; len = str.length; for(i = 0; i < len; i++) { c = str.charCodeAt(i); if ((c >= 0x0001) && (c <= 0x007F)) { out += str.charAt(i); } else if (c > 0x07FF) { out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F)); out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F)); out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F)); } else { out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F)); out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F)); } } return out; } return output; }

2、urldecode

使用方法：urldecode(url);

function urldecode(encodedString) { var output = encodedString; var binVal, thisString; var myregexp = /(%[^%]{2})/; function utf8to16(str) { var out, i, len, c; var char2, char3; out = ""; len = str.length; i = 0; while(i < len) { c = str.charCodeAt(i++); switch(c >> 4) { case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: out += str.charAt(i-1); break; case 12: case 13: char2 = str.charCodeAt(i++); out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F)); break; case 14: char2 = str.charCodeAt(i++); char3 = str.charCodeAt(i++); out += String.fromCharCode(((c & 0x0F) << 12) | ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0)); break; } } return out; } while((match = myregexp.exec(output)) != null && match.length > 1 && match[1] != '') { binVal = parseInt(match[1].substr(1),16); thisString = String.fromCharCode(binVal); output = output.replace(match[1], thisString); } //output = utf8to16(output); output = output.replace(/+/g, " "); output = utf8to16(output); return output; }

当服务器端通过php的urlencode转码的就可以使用js的urldecode进行解析即可。