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in Technique[技术] by (71.8m points)

八个字节如何转换为一个整数?

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截出来的数据例子:
[0, 3, 158, 240, 118, 1, 0, 0]


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// 获取数字
function getNum(arr) {
  return Number(
    "0b" +
      arr
        .reverse() // 因为要后面的左移,所以后面的是高位,需要倒叙
        .map((item) => item.toString(2).padStart(8, "0")) // 拓展到8位
        .join("") //0b是二进制的意思
  );
}

// 获取字节数组
function getBitArr(num) {
  return num
    .toString(2) // 转二进制
    .padStart(64, "0") // 拓展到64位
    .match(/.{8}/g) // 按8位进行分割
    .map((item) => Number("0b" + item)) // 分段获取数值
    .reverse(); // 倒叙还原
}

let arr = [0, 3, 158, 240, 118, 1, 0, 0];
let num = getNum([0, 3, 158, 240, 118, 1, 0, 0]);
console.log(num); // 1610354656000
console.log(getBitArr(num)); //[0, 3, 158, 240, 118, 1, 0, 0]

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