<script>
    //当前时间与2017-04-04的时间差
    var startTime = "2017-04-04";
    var s1 = new Date(startTime.replace(/-/g, "/")),
    s2 = new Date(),
    runTime = parseInt((s2.getTime() - s1.getTime()) / 1000);
    var year = Math.floor(runTime / 86400 / 365);
    runTime = runTime % (86400 * 365);
    var month = Math.floor(runTime / 86400 / 30);
    runTime = runTime % (86400 * 30);
    var day = Math.floor(runTime / 86400);
    runTime = runTime % 86400;
    var hour = Math.floor(runTime / 3600);
    runTime = runTime % 3600;
    var minute = Math.floor(runTime / 60);
    runTime = runTime % 60;
    var second = runTime;
    console.log(year,month,day,hour,minute,second);
</script>

這是我之前寫的，

雷雷

推薦直接用第三方momentjs就行了
覺得答案可以記得追蹤fundebug（免費全端監測網站）