一：UTF8编码函数

function URLEncode(Str){
  if(Str==null||Str=="")
    return "";
  var newStr="";
  function toCase(sStr){
    return sStr.toString(16).toUpperCase();
    }
  for(var i=0,icode,len=Str.length;i<len;i++){
    icode=Str.charCodeAt(i);
    if( icode<0x10)
      newStr+="%0"+icode.toString(16).toUpperCase();
    else if(icode<0x80){
      if(icode==0x20)
        newStr+="+";
      else if((icode>=0x30&&icode<=0x39)||(icode>=0x41&&icode<=0x5A)||(icode>=0x61&&icode<=0x7A))
        newStr+=Str.charAt(i);
      else
        newStr+="%"+toCase(icode);
      }
    else if(icode<0x800){
      newStr+="%"+toCase(0xC0+(icode>>6));
      newStr+="%"+toCase(0x80+icode%0x40);
      }
    else{
      newStr+="%"+toCase(0xE0+(icode>>12));
      newStr+="%"+toCase(0x80+(icode>>6)%0x40);
      newStr+="%"+toCase(0x80+icode%0x40);
      }
    }
  return newStr;

?

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二：Base64编码,解码函数

var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 
var base64DecodeChars = new Array( 
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, 
    -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, 
    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1); 

function base64encode(str) { 
    var out, i, len; 
    var c1, c2, c3; 

    len = str.length; 
    i = 0; 
    out = ""; 
    while(i < len) { 
    c1 = str.charCodeAt(i++) & 0xff; 
    if(i == len) 
    { 
        out += base64EncodeChars.charAt(c1 >> 2); 
        out += base64EncodeChars.charAt((c1 & 0x3) << 4); 
        out += "=="; 
        break; 
    } 
    c2 = str.charCodeAt(i++); 
    if(i == len) 
    { 
        out += base64EncodeChars.charAt(c1 >> 2); 
        out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)); 
        out += base64EncodeChars.charAt((c2 & 0xF) << 2); 
        out += "="; 
        break; 
    } 
    c3 = str.charCodeAt(i++); 
    out += base64EncodeChars.charAt(c1 >> 2); 
    out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)); 
    out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6)); 
    out += base64EncodeChars.charAt(c3 & 0x3F); 
    } 
    return out; 
} 

function base64decode(str) { 
    var c1, c2, c3, c4; 
    var i, len, out; 

    len = str.length; 
    i = 0; 
    out = ""; 
    while(i < len) { 
    /* c1 */ 
    do { 
        c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff]; 
    } while(i < len && c1 == -1); 
    if(c1 == -1) 
        break; 

    /* c2 */ 
    do { 
        c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff]; 
    } while(i < len && c2 == -1); 
    if(c2 == -1) 
        break; 

    out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4)); 

    /* c3 */ 
    do { 
        c3 = str.charCodeAt(i++) & 0xff; 
        if(c3 == 61) 
        return out; 
        c3 = base64DecodeChars[c3]; 
    } while(i < len && c3 == -1); 
    if(c3 == -1) 
        break; 

    out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2)); 

    /* c4 */ 
    do { 
        c4 = str.charCodeAt(i++) & 0xff; 
        if(c4 == 61) 
        return out; 
        c4 = base64DecodeChars[c4]; 
    } while(i < len && c4 == -1); 
    if(c4 == -1) 
        break; 
    out += String.fromCharCode(((c3 & 0x03) << 6