js中hex各种转换总结以及crc

最新推荐文章于 2025-06-21 07:00:00 发布

苟修金撒玛

最新推荐文章于 2025-06-21 07:00:00 发布

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文章标签： js

本文链接：https://blog.youkuaiyun.com/sinat_38349704/article/details/108007633

本文详细介绍JavaScript中十六进制与其他类型（如整数、浮点数、字符串）的转换方法，包括十六进制与双精度、单精度浮点数的互转，以及十六进制与字符串的相互转换。此外，还提供了ArrayBuffer到十六进制字符串的转换函数。

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js中hex各种转换总结

包含int和hex互转，hex和double、float互转，string和hex转换

var HEX = {};

/**
 * @param {Object} buffer
 * ArrayBuffer转16进制字符串
 */

HEX.ab2hex = function(buffer) {
	const hexArr = Array.prototype.map.call(
		new Uint8Array(buffer),
		function(bit) {
			return ('00' + bit.toString(16)).slice(-2)
		}
	)
	return hexArr.join('')
}

//int转hex
HEX.intTohex = function(data, len) {
	// console.log(data);
	len = len * 2;
	var retVal = data.toString(16);
	//console.log(retVal);
	if (retVal.length > len) return retVal;
	var length = retVal.length;
	for (var i = 0; i < len - length; i++) {
		retVal = '0' + retVal;
	}
	return retVal;
}

//需要用到的函数
HEX.InsertString = function(t, c, n) {
	var r = new Array();
	for (var i = 0; i * 2 < t.length; i++) {
		r.push(t.substr(i * 2, n));
	}
	return r.join(c);
}
//需要用到的函数
HEX.FillString = function(t, c, n, b) {
	if ((t == "") || (c.length != 1) || (n <= t.length)) {
		return t;
	}
	var l = t.length;
	for (var i = 0; i < n - l; i++) {
		if (b == true) {
			t = c + t;
		} else {
			t += c;
		}
	}
	return t;
}
//16进制转双精度浮点数
HEX.HexToDouble = function(temp) {
	let ret=''
	for(let i=0;i<temp.length;i=i+2){
		ret=temp.substr(i,2)+ret;
	}
	temp=ret;
	
	let S_Bin = ""; //转化后的二进制字符串
	for (let i = 0; i < temp.length; i++) {
		let temp1 = temp.charAt(i);
		S_Bin = S_Bin + HEX.charToBin(temp1);
	}


	let sign = 0; //符号位    
	if (S_Bin.charAt(0) == '1') {
		sign = 1;
	}

	let exponent = "";
	for (let i = 1; i < 12; i++) {
		if (S_Bin.charAt(i) == '1') {
			exponent = exponent + '1';
		} else
			exponent = exponent + '0';
	}

	let exponent_double = 0; //阶码
	exponent_double = HEX.stringToDouble(exponent);
	exponent_double = exponent_double - 1023;


	let mantissa_temp = "";
	for (let i = 12; i < 64; i++) {
		if (S_Bin.charAt(i) == '1') {
			mantissa_temp = mantissa_temp + '1';
		} else
			mantissa_temp = mantissa_temp + '0';
	}
	let mantissa = 0;
	mantissa = HEX.BenToDex(mantissa_temp);
	mantissa = mantissa + 1.0;


	let res = 0;
	let a, c;
	a = Math.pow((-1), sign);
	c = Math.pow(2, exponent_double);
	res = a * mantissa * c;


	return res;
}

HEX.charToBin = function(temp) {
	return HEX.FillString(parseInt(temp, 16).toString(2), '0', 4, true);
}

HEX.stringToDouble = function(temp) {
	let res = 0;
	for (let i = 0; i < temp.length; i++) {
		res = res * 2 + (temp[i] - '0');
	}
	return res;
}

HEX.BenToDex = function(temp) {
	let m = temp.length;
	let res = 0;
	for (let i = 0; i < m; i++) {
		res = res + (temp[i] - '0') * Math.pow(2, -i - 1);
	}
	return res;
}

//16进制转单精度浮点数
HEX.HexToSingle = function(t) {
	t = t.replace(/\s+/g, "");
	if (t == "") {
		return 0;
	}
	if (t == "00000000") {
		return 0;
	}
	if ((t.length > 8) || (isNaN(parseInt(t, 16)))) {
		return "Error";
	}
	if (t.length < 8) {
		t = HEX.FillString(t, "0", 8, true);
	}
	t = parseInt(t, 16).toString(2);
	t = HEX.FillString(t, "0", 32, true);
	var s = t.substring(0, 1);
	var e = t.substring(1, 9);
	var m = t.substring(9);
	e = parseInt(e, 2) - 127;
	m = "1" + m;
	if (e >= 0) {
		m = m.substr(0, e + 1) + "." + m.substring(e + 1)
	} else {
		m = "0." + HEX.FillString(m, "0", m.length - e - 1, true)
	}
	if (m.indexOf(".") == -1) {
		m = m + ".0";
	}
	var a = m.split(".");
	var mi = parseInt(a[0], 2);
	var mf = 0;
	for (var i = 0; i < a[1].length; i++) {
		mf += parseFloat(a[1].charAt(i)) * Math.pow(2, -(i + 1));
	}
	m = parseInt(mi) + parseFloat(mf);
	if (s == 1) {
		m = 0 - m;
	}
	return m;
}
//浮点数转16进制
HEX.SingleToHex = function(t) {
	if (t == "") {
		return "";
	}
	//console.log(t);
	t = parseFloat(t);
	//console.log(t);
	if (isNaN(t) == true) {
		return "Error";
	}
	if (t == 0) {
		return "00000000";
	}
	var s,
		e,
		m;
	if (t > 0) {
		s = 0;
	} else {
		s = 1;
		t = 0 - t;
	}
	m = t.toString(2);
	if (m >= 1) {
		if (m.indexOf(".") == -1) {
			m = m + ".0";
		}
		e = m.indexOf(".") - 1;
	} else {
		e = 1 - m.indexOf("1");
	}
	if (e >= 0) {
		m = m.replace(".", "");
	} else {
		m = m.substring(m.indexOf("1"));
	}
	if (m.length > 24) {
		m = m.substr(0, 24);
	} else {
		m = HEX.FillString(m, "0", 24, false)
	}
	m = m.substring(1);
	e = (e + 127).toString(2);
	e = HEX.FillString(e, "0", 8, true);
	var r = parseInt(s + e + m, 2).toString(16);
	r = HEX.FillString(r, "0", 8, true);
	return HEX.InsertString(r, "", 2).toUpperCase();
}

HEX.stringToHex = function(str) {
	var val = "";
	for (var i = 0; i < str.length; i++) {
		if (val == "")
			val = str.charCodeAt(i).toString(16);
		else
			val += str.charCodeAt(i).toString(16);
	}
	return val;
}

HEX.hexToString = function(hexCharCodeStr) {
	var trimedStr = hexCharCodeStr.trim();
	var rawStr =
		trimedStr.substr(0, 2).toLowerCase() === "0x" ?
		trimedStr.substr(2) :
		trimedStr;
	var len = rawStr.length;
	if (len % 2 !== 0) {
		alert("Illegal Format ASCII Code!");
		return "";
	}
	var curCharCode;
	var resultStr = [];
	for (var i = 0; i < len; i = i + 2) {
		if (rawStr.substr(i, 2) == '00') {
			resultStr.push('');
		} else {
			curCharCode = parseInt(rawStr.substr(i, 2), 16); // ASCII Code Value
			resultStr.push(String.fromCharCode(curCharCode));
		}
	}
	return resultStr.join("");
}

HEX.add0 = function(m) {
	return m < 10 ? '0' + m : m
}

export default HEX;

CRC

一个是ToCRC16，一个是ToModbusCRC16

var CRC = {};

CRC.CRC16 = function (data) {
    var len = data.length;
    if (len > 0) {
        var crc = 0xFFFF;

        for (var i = 0; i < len; i++) {
            crc = (crc ^ (data[i]));
            for (var j = 0; j < 8; j++) {
                crc = (crc & 1) != 0 ? ((crc >> 1) ^ 0xA001) : (crc >> 1);
            }
        }
        var hi = ((crc & 0xFF00) >> 8);  //高位置
        var lo = (crc & 0x00FF);         //低位置

        return [hi, lo];
    }
    return [0, 0];
};

CRC.isArray = function (arr) {
    return Object.prototype.toString.call(arr) === '[object Array]';
};

CRC.ToCRC16 = function (str, isReverse) {
    return CRC.toString(CRC.CRC16(CRC.isArray(str) ? str : CRC.strToByte(str)), isReverse);
};

CRC.ToModbusCRC16 = function (str, isReverse) {
    return CRC.toString(CRC.CRC16(CRC.isArray(str) ? str : CRC.strToHex(str)), isReverse);
};

CRC.strToByte = function (str) {
    var tmp = str.split(''), arr = [];
    for (var i = 0, c = tmp.length; i < c; i++) {
        var j = encodeURI(tmp[i]);
        if (j.length == 1) {
            arr.push(j.charCodeAt());
        } else {
            var b = j.split('%');
            for (var m = 1; m < b.length; m++) {
                arr.push(parseInt('0x' + b[m]));
            }
        }
    }
    return arr;
};

CRC.convertChinese = function (str) {
    var tmp = str.split(''), arr = [];
    for (var i = 0, c = tmp.length; i < c; i++) {
        var s = tmp[i].charCodeAt();
        if (s <= 0 || s >= 127) {
            arr.push(s.toString(16));
        }
        else {
            arr.push(tmp[i]);
        }
    }
    return arr;
};

CRC.filterChinese = function (str) {
    var tmp = str.split(''), arr = [];
    for (var i = 0, c = tmp.length; i < c; i++) {
        var s = tmp[i].charCodeAt();
        if (s > 0 && s < 127) {
            arr.push(tmp[i]);
        }
    }
    return arr;
};

CRC.strToHex = function (hex, isFilterChinese) {
    hex = isFilterChinese ? CRC.filterChinese(hex).join('') : CRC.convertChinese(hex).join('');

    //清除所有空格
    hex = hex.replace(/\s/g, "");
    //若字符个数为奇数，补一个0
    hex += hex.length % 2 != 0 ? "0" : "";

    var c = hex.length / 2, arr = [];
    for (var i = 0; i < c; i++) {
        arr.push(parseInt(hex.substr(i * 2, 2), 16));
    }
    return arr;
};

CRC.padLeft = function (s, w, pc) {
    if (pc == undefined) {
        pc = '0';
    }
    for (var i = 0, c = w - s.length; i < c; i++) {
        s = pc + s;
    }
    return s;
};

CRC.toString = function (arr, isReverse) {
    if (typeof isReverse == 'undefined') {
        isReverse = true;
    }
    var hi = arr[0], lo = arr[1];
    return CRC.padLeft((isReverse ? hi + lo * 0x100 : hi * 0x100 + lo).toString(16).toUpperCase(), 4, '0');
};

export default CRC;