function compareTime(){
        var beginTime = "2019-5-16 17:20:0";
        var endTime = "2019-5-16 16:39:32";
     
        var beginTimes =beginTime.replace(/-/g,"/");
        var endTimes =endTime.replace(/-/g,"/");
        console.log("beginTimes         =" + beginTimes); 
        console.log("endTimes           =" +endTimes); 
        //主要代码
        var a =(Date.parse(endTimes)-Date.parse(beginTimes))/3600/1000; 
        if(a<0){
            console.log("endTime小!");
        }else if (a>0){
            console.log("endTime大!");
        }else if (a==0){
            console.log("相等!");
        }
    }