一个不错的字符串转码解码函数(自写)

function isString(variable) { return Object.prototype.toString.call(variable).indexOf('String') != -1; } function isNumeric(variable) { return !isNaN(parseFloat(variable)) && isFinite(variable); } function stringEncode(string) { string = isString(string) || isNumeric(string) ? String(string) : ''; var code, i = 0, code_string = '', len = string.length; while(i < string.length) { code = string.charCodeAt(i); code_string += '' + String(code).length + code; i++; } return code_string; } function stringDecode(code) { var i = 0, code_len, decode_string = ''; code = String(code); while(i < code.length) { code_len = +code.charAt(i); i++; decode_string += String.fromCharCode(+code.substr(i, code_len)); i += code_len; } return decode_string; }