用JavaScript实现PHP的urlencode与urldecode函数

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本文介绍了php函数urlencode的js实现方法并比较js和php各编码函数的区别。

通常form表单的enctype类型为 application/x-www-form-urlencoded, 当表单提交后，提交的数据自动被编码， 规则为" 除了 -_. 之外的所有非字母数字字符都将被替换成百分号（%）后跟两位十六进制数，空格则编码为加号（+）。", php的urlencode函数与其功能相同。

1. js编码方法

js编码方法：escape, encodeURI, encodeURIComponent。
escape可以对大多数符号进行编码，但是对unicode字符无效。

2.php编码方法

php编码方法：urlencode, rawurlencode, htmlentities。
urlencode和rawurlencode唯一的区别是对空格的编码方式不同，rawurlencode遵循RFC 1738编码将空格转换为
%20。

如何用js实现php的urlencode功能,从网上找了两种方法，在这里整合出来

1. 方法一

export default {// public method for url encodingencode : function (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;},// public method for url decodingdecode : function (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;}
}

2. 方法二

export default {// public method for url encodingencode : function (string) {return escape(this._utf8_encode(string));},// public method for url decodingdecode : function (string) {return this._utf8_decode(unescape(string));},// private method for UTF-8 encoding_utf8_encode : function (string) {string = string.replace(/\r\n/g,"\n");var utftext = "";for (var n = 0; n < string.length; n++) {var c = string.charCodeAt(n);if (c < 128) {utftext += String.fromCharCode(c);}else if((c > 127) && (c < 2048)) {utftext += String.fromCharCode((c >> 6) | 192);utftext += String.fromCharCode((c & 63) | 128);}else {utftext += String.fromCharCode((c >> 12) | 224);utftext += String.fromCharCode(((c >> 6) & 63) | 128);utftext += String.fromCharCode((c & 63) | 128);}}return utftext;},// private method for UTF-8 decoding_utf8_decode : function (utftext) {var string = "";var i = 0;var c = c1 = c2 = 0;while ( i < utftext.length ) {c = utftext.charCodeAt(i);if (c < 128) {string += String.fromCharCode(c);i++;}else if((c > 191) && (c < 224)) {c2 = utftext.charCodeAt(i+1);string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));i += 2;}else {c2 = utftext.charCodeAt(i+1);c3 = utftext.charCodeAt(i+2);string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));i += 3;}}return string;}
}

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