求两段时间相差多少的办法

//之前的时间

var date1 = new Date("2017-12-10 12:20:45");

//之后的时间
var date2 = new Date("2018-12-4 12:20:45");
var s1 = date1.getTime(),
      s2 = date2.getTime();
var total = (s2 - s1) / 1000;
var day = parseInt(total / (24 * 60 * 60),10); //计算整数天数
var afterDay = total - day * 24 * 60 * 60; //取得算出天数后剩余的秒数
var hour = parseInt(afterDay / (60 * 60),10); //计算整数小时数
var afterHour = total - day * 24 * 60 * 60 - hour * 60 * 60; //取得算出小时数后剩余的秒数
var min = parseInt(afterHour / 60,10); //计算整数分
var afterMin = total - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60; //取得算出分后剩余的秒数
var duration = day + "天" + hour + "小时" + min + "分钟" + afterMin + "秒";

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转载自blog.csdn.net/soldierofyou/article/details/84792322