SOURCE

function minux(a, b) {
    let origin = a.split("-");
    let result = b.split("-");


    if (Number(result[1]) > Number(origin[1])) {
        if (Number(result[2]) >= Number(origin[2])) {
            let ss1 = Number(result[1]) - Number(origin[1]);
            let ss2 = Number(result[2]) - Number(origin[2]);
            if (Number(result[3]) > Number(origin[3])) {
                return ss1 * 60 * 1000 + ss2 * 1000 + Number(result[3]) - Number(origin[3]);
            } else {
                return ss1 * 60 * 1000 + (ss2 - 1) * 1000 + Number(result[3]) + 1000 - Number(origin[3]);
            }
        } else {
            let ss1 = Number(result[1]) - Number(origin[1])-1;
            let ss2 = Number(result[2]) + 60 - Number(origin[2]);
            if (Number(result[3]) > Number(origin[3])) {
                return ss1 * 60 * 1000 + ss2 * 1000 + Number(result[3]) - Number(origin[3]);
            } else {
                return ss1 * 60 * 1000 + (ss2 - 1) * 1000 + Number(result[3]) + 1000 - Number(origin[3]);
            }
        }
    } else {
        //分钟数等于
        let ss = Number(result[2]) - Number(origin[2]);
        if (Number(result[3]) > Number(origin[3])) {
            return ss * 1000 + Number(result[3]) - Number(origin[3]);
        } else {
            return (ss - 1) * 1000 + Number(result[3]) + 1000 - Number(origin[3]);
        }
    }


}


console.log(minux("16-38-12-468", "16-39-17-255"));