第(3/7)节   do {                c3 = str.chrCodeAt(++) & 0xff;                f (c3 == 61) returut;                c3 = bse64DecodeChrs[c3];            } whle (  2));            do {                c4 = str.chrCodeAt(++) & 0xff;                f (c4 == 61) returut;                c4 = bse64DecodeChrs[c4];            } whle ( > 12) & 0x0F));                out += Strg.fromChrCode(0x80 | ((c >> 6) & 0x3F));                out += Strg.fromChrCode(0x80 | ((c >> 0) & 0x3F));            } else {                out += Strg.fromChrCode(0xC0 | ((c >> 6) & 0x1F));                out += Strg.fromChrCode(0x80 | ((c >> 0) & 0x3F));            }        }        returut;    }    functon utf8to16(str) {        vr out, , len, c;        vr chr2, chr3;        out = ””;        len = str.length;         = 0;        whle ( > 4) {            cse 0:            cse 1:            cse 2:            cse 3:            cse 4:            cse 5:            cse 6:            cse 7:                out += str.chrAt( - 1);                brek;            cse 12:            cse 13:                chr2 = str.chrCodeAt(++);                out += Strg.fromChrCode(((c & 
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