MeiYuchen's blog on Git

str2utf8

If you find the strind get from server can not show Chinese right, and your coding is utf-8, you can try convert the string to utf-8.

function strToUtf8(strUtf8) {
    if(!strUtf8){
        return;
    }

    var bstr = "";
    var nTotalChars = strUtf8.length; 	// total chars to be processed.
    var nOffset = 0; 			// processing point on strUtf8
    var nRemainingBytes = nTotalChars; 	// how many bytes left to be converted
    var nOutputPosition = 0;
    var iCode, iCode1, iCode2; 		// the value of the unicode.
    while (nOffset < nTotalChars) {
        iCode = strUtf8.charCodeAt(nOffset);
        if ((iCode & 0x80) == 0) 	// 1 byte.
        {
            if (nRemainingBytes < 1) 	// not enough data
                break;
            bstr += String.fromCharCode(iCode & 0x7F);
            nOffset++;
            nRemainingBytes -= 1;
        }
        else if ((iCode & 0xE0) == 0xC0) // 2 bytes
        {
            iCode1 = strUtf8.charCodeAt(nOffset + 1);
            if (nRemainingBytes < 2 ||		// not enough data
                (iCode1 & 0xC0) != 0x80) 	// invalid pattern
            {
                break;
            }
            bstr += String
                .fromCharCode(((iCode & 0x3F) << 6) | (iCode1 & 0x3F));
            nOffset += 2;
            nRemainingBytes -= 2;
        } else if ((iCode & 0xF0) == 0xE0) // 3 bytes
        {
            iCode1 = strUtf8.charCodeAt(nOffset + 1);
            iCode2 = strUtf8.charCodeAt(nOffset + 2);
            if (nRemainingBytes < 3 || // not enough data
                (iCode1 & 0xC0) != 0x80 || // invalid pattern
                (iCode2 & 0xC0) != 0x80) {
                break;
            }
            bstr += String.fromCharCode(((iCode & 0x0F) << 12)
                | ((iCode1 & 0x3F) << 6) | (iCode2 & 0x3F));
            nOffset += 3;
            nRemainingBytes -= 3;
        } else
        // 4 or more bytes -- unsupported
            break;
    }
    if (nRemainingBytes != 0) { // bad UTF8 string.
        return "";
    }
    return bstr;
}