js获得时间戳完整代码如下

完整代码如下
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>时间戳</title>
</head>

<body>

    <script>
        //添加0的方法
        function addZero(num) {
            num = num.toString();
            return num[1] ? num : "0" + num;
        }
        // console.log(addZero(5));
        function fmtTime(str) {
            let now = new Date();
            let thatTime = new Date(str);
            //now - thatTime  结果为相差的毫秒数，
            let totalSec = Math.floor((now - thatTime) / 1000); //获得秒钟
            if (totalSec < 60) return "刚刚";
            //1小时以内显示多少分钟前
            else if (totalSec < 60 * 60) return Math.floor(totalSec / 60) + "分钟前";
            //1天以内显示多少小时前
            else if (totalSec < 60 * 60 * 24) return Math.floor(totalSec / 60 / 60) + "小时前"
            //大于一天则显示具体的时间
            else return [thatTime.getFullYear(), addZero(thatTime.getMonth() + 1),
               addZero( thatTime.getDate())
            ].join("-") + " " + [addZero(thatTime.getHours()), addZero(thatTime.getMinutes()), addZero(thatTime.getSeconds())].join(":");
        }
        console.log(fmtTime("2019-08-01 8:10:59"))
    </script>
</body>

</html>