Summary and Organize Commonly Used Functions in JavaScript

function base64encode(str){
    var out,i,len,base64EncodeChars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var c1,c2,c3;
    len=;
    i=0;
    out="";
    while(i<len){
        c1=(i++)&0xff;
        if(i==len){
            out+=(c1>>2);
            out+=((c1&0x3)<<4);
            out+="==";
            break;
        }
        c2=(i++);
        if(i==len){
            out+=(c1>>2);
            out+=(((c1&0x3)<<4)|((c2&0xF0)>>4));
            out+=((c2&0xF)<<2);
            out+="=";
            break;
        }
        c3=(i++);
        out+=(c1>>2);
        out+=(((c1&0x3)<<4)|((c2&0xF0)>>4));
        out+=(((c2&0xF)<<2)|((c3&0xC0)>>6));
        out+=(c3&0x3F);
    }
    return out;
}
function base64decode(str){
    var c1,c2,c3,c4,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);
    var i,len,out;
    len=;
    i=0;
    out="";
    while(i<len){
        /* c1 */
        do{
            c1=base64DecodeChars[(i++)&0xff];
        }while(i<len&&c1==-1);
        if(c1==-1) break;
        /* c2 */
        do{
            c2=base64DecodeChars[(i++)&0xff];
        }while(i<len&&c2==-1);
        if(c2==-1) break;
        out+=((c1<<2)|((c2&0x30)>>4));
        /* c3 */
        do{
            c3=(i++)&0xff;
            if(c3==61) return out;
            c3=base64DecodeChars[c3];
        }while(i<len&&c3==-1);
        if(c3==-1) break;
        out+=(((c2&0XF)<<4)|((c3&0x3C)>>2));
        /* c4 */
        do{
            c4=(i++)&0xff;
            if(c4==61) return out;
            c4=base64DecodeChars[c4];
        }while(i<len&&c4==-1);
        if(c4==-1) break;
        out+=(((c3&0x03)<<6)|c4);
    }
    return out;
}
function utf16to8(str){
    var out,i,len,c;
    out="";
    len=;
    for (i=0;i<len;i++){
        c=(i);
        if((c>=0x0001)&&(c<=0x007F)){
            out+=(i);
        } else if(c>0x07FF){
            out+=(0xE0|((c>>12)&0x0F));
            out+=(0x80|((c>>6)&0x3F));
            out+=(0x80|((c>>0)&0x3F));
        } else {
            out+=(0xC0|((c>>6)&0x1F));
            out+=(0x80|((c>>0)&0x3F));
        }
    }
    return out;
}
function utf8to16(str){
    var out,i,len,c;
    var char2,char3;
    out="";
    len=;
    i=0;
    while(i<len){
        c=(i++);
        switch (c>>4){
        case 0:
        case 1:
        case 2:
        case 3:
        case 4:
        case 5:
        case 6:
        case 7:
            // 0xxxxxxx
            out+=(i-1);
            break;
        case 12:
        case 13:
            // 110x xxxx   10xx xxxx
            char2=(i++);
            out+=(((c&0x1F)<<6)|(char2&0x3F));
            break;
        case 14:
            // 1110 xxxx  10xx xxxx  10xx xxxx
            char2=(i++);
            char3=(i++);
            out+=(((c&0x0F)<<12)|((char2&0x3F)<<6)|((char3&0x3F)<<0));
            break;
        }
    }
    return out;
}