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 开发小程序蓝牙开锁，应用到了16进制相关操作方法，记录一下相关方法。

// ArrayBuffer转16进制字符串
export const ab2hex = (buffer) => {
    const hexArr = Array.prototype.map.call(
        new Uint8Array(buffer),
        function(bit) {
            return ('00' + bit.toString(16)).slice(-2);
        }
    )
    return hexArr.join('');
}


// 16进制字符串转ArrayBuffer
export const string2buffer = (str) => {
    const buf = new ArrayBuffer(str.length / 2);
    const bufView = new Uint8Array(buf);
    for (let i = 0, strLen = str.length; i < strLen; i++) {
        bufView[i] = parseInt(str.slice(i * 2, i * 2 + 2), 16);
    }
    return buf;
}


// 16进制字符串分隔每两个字符成数组
export const hexStr2ToArray = (str) => {
    const arr = [];
    for (let i = 0, len = str.length / 2; i < len; i++) {
        arr.push(str.slice(i * 2, i * 2 + 2));
    }
    return arr;
}


// 10进制数组转16进制字符串
export const intArrToHexStr = (arr) => {
    let rArr = [];
    for (let i = 0, len = arr.length; i < len; i++) {
        const item = arr[i].toString(16);
        rArr.push(item.length === 1 ? '0' + item : item);
    }
    return rArr.join('');
}