主题：crc16验证

甜老师，你的这种写法可以。

我里面的代码以及调试的结果是这样：

我用字符串和用hex算出来的值也不一样

1、js这样写

 

function CRC16func(AllDATA) {

    var cnCRC_CCITT = 0x1021;

    var i = -1,
    j = -1;

    var nData = -1,
    nAccum = -1,
    nYAccum = -1;

    var Table_CRC = [];

    var aSize = AllDATA.length;

    for (i = 0; i < 256; i++) {

        nData = C16func.call(this, i, 8);

        nAccum = 0;

        for (j = 0; j < 8; j++) {

            if ((nData ^ nAccum) & 0x8000) {

                nAccum = C16func.call(this, nAccum, 1);

                nAccum = nAccum ^ cnCRC_CCITT;

            } else {

                nAccum = C16func.call(this, nAccum, 1);

                nAccum = nAccum;

            }

            nData = C16func.call(this, nData, 1);

        }

        Table_CRC[i] = nAccum;

    }

    nAccum = 0;

    for (i = 0; i < aSize; i++) {

        nYAccum = nAccum;

        nAccum = C16func.call(this, nAccum, 8);

        nAccum = nAccum ^ Table_CRC[(nYAccum >>> 8) ^ (AllDATA.charCodeAt(i))];

    }

    return nAccum.toString(16).toUpperCase();

}

function C16func(cData, cLen) {

    if (((cData << cLen).toString(2).length > 16) && (cData.toString(2).length <= 16)) {

        cData = (cData << cLen).toString(2).substr((cData << cLen).toString(2).length - 16, 16);

        cData = parseInt(cData, 2);

    } else {

        cData = cData << cLen;

    }

    return cData;

}

 

 

2、这样调用

 

var str = "12345678";
alert(CRC16func(str));

感恩！！