JS urlencode,urldecode

var LittleUrl = {  
    // public method for url encoding  
    encode : function (string) {  
        return escape(this._utf8_encode(string));  
    },  
    // public method for url decoding  
    decode : 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;  
    }  
}  

 

原文地址：http://willeager.iteye.com/blog/1061824