js byte陣列與16進位制字串互轉(對負值填坑)
阿新 • • 發佈:2018-11-07
//十六進位制字串轉位元組陣列,跟網上demo一樣
function HexString2Bytes(str) {
var pos = 0;
var len = str.length;
if (len % 2 != 0) {
return null;
}
len /= 2;
var arrBytes = new Array();
for (var i = 0; i < len; i++) {
var s = str.substr(pos, 2);
var v = parseInt(s, 16);
arrBytes.push(v);
pos += 2;
}
return arrBytes;
}
//位元組陣列轉十六進位制字串,對負值填坑
function Bytes2HexString(arrBytes) {
var str = "";
for (var i = 0; i < arrBytes.length; i++) {
var tmp;
var num=arrBytes[i];
if (num < 0) {
//此處填坑,當byte因為符合位導致數值為負時候,需要對資料進行處理
tmp =(255+num+1).toString(16);
} else {
tmp = num.toString(16);
}
if (tmp.length == 1) {
tmp = "0" + tmp;
}
str += tmp;
}
return str;
}