alert(GetDateDiff("2018-02-27 19:20:22","2018-02-27 09:20:22","hour"));

function GetDateDiff(startTime, endTime, diffType) {
  //將xxxx-xx-xx的時(shí)間格式，轉(zhuǎn)換為 xxxx/xx/xx的格式 
  startTime = startTime.replace(/\-/g, "/");
  endTime = endTime.replace(/\-/g, "/");
  //將計(jì)算間隔類性字符轉(zhuǎn)換為小寫
  diffType = diffType.toLowerCase();
  var sTime =new Date(startTime); //開始時(shí)間
  var eTime =new Date(endTime); //結(jié)束時(shí)間
  //作為除數(shù)的數(shù)字
  var timeType =1;
  switch (diffType) {
    case"second":
      timeType =1000;
    break;
    case"minute":
      timeType =1000*60;
    break;
    case"hour":
      timeType =1000*3600;
    break;
    case"day":
      timeType =1000*3600*24;
    break;
    default:
    break;
  }
  return parseInt((eTime.getTime() - sTime.getTime()) / parseInt(timeType));
}

var date1=new Date(); //開始時(shí)間
alert("aa");
var date2=new Date();  //結(jié)束時(shí)間
var date3=date2.getTime()-date1.getTime() //時(shí)間差的毫秒數(shù)
//計(jì)算出相差天數(shù)
var days=Math.floor(date3/(24*3600*1000))
//計(jì)算出小時(shí)數(shù)
var leave1=date3%(24*3600*1000)  //計(jì)算天數(shù)后剩余的毫秒數(shù)
var hours=Math.floor(leave1/(3600*1000))
//計(jì)算相差分鐘數(shù)
var leave2=leave1%(3600*1000)    //計(jì)算小時(shí)數(shù)后剩余的毫秒數(shù)
var minutes=Math.floor(leave2/(60*1000))
//計(jì)算相差秒數(shù)
var leave3=leave2%(60*1000)   //計(jì)算分鐘數(shù)后剩余的毫秒數(shù)
var seconds=Math.round(leave3/1000)
alert(" 相差 "+days+"天 "+hours+"小時(shí) "+minutes+" 分鐘"+seconds+" 秒")