let hexString = "202200010A036406AE00180064010D02A9FFFE000802DE02E502CC01DA019305600137000B00160A5300000B3C0A8D0901809403630789078A1282F951F984F985F96DF9B6F9ECFC0AFB8EF96FF98F01FB017A01310129FD5EFDE8FC41FC3DF9B8F9D200240754FFF501BF4F85";

let substring = hexString.substring(118, 122);
let decimalNumber = parseInt(substring, 16);
console.log(decimalNumber);

function hexToDecimal(hex) {
    // 检查符号位
    var isNegative = false;
    if (hex.charAt(0) === '-') {
        isNegative = true;
        hex = hex.substr(1); // 去除负号
    }

    // 将16进制转换为10进制
    var decimal = parseInt(hex, 16);

    // 应用符号位
    if (isNegative) {
        decimal = -decimal;
    }

    return decimal;
}
function hexTo(hex){
    if (hex?.length % 2) { hex = '0' + hex; }

    let bn = BigInt('0x' + hex);

   return bn.toString(10);
}
function hexToBn(hex) {
    if (hex?.length % 2) {
        hex = '0' + hex;
    }

    let highbyte = parseInt(hex.slice(0, 2), 16)
    let bn = BigInt('0x' + hex);

    if (0x80 & highbyte) {
        bn = BigInt('0b' + bn.toString(2).split('').map(function (i) {
            return '0' === i ? 1 : 0
        }).join('')) + BigInt(1);
        bn = -bn;
    }

    return Number(bn);
}

console.log(hexToBn(substring));
console.log("结果")