js比较日期大小

方法一：

function judgeTime(str1,str2){
        var y1 = getNum(1,str1);
   var m1 = parseInt(getNum(2,str1)) - 1;
   var d1 = getNum(3,str1);
   var h1 = getNum(4,str1);
   var mu1 = getNum(5,str1);
   var s1 = getNum(6,str1);
   
   var y2 = getNum(1,str2);
   var m2 = parseInt(getNum(2,str2)) - 1;
   var d2 = getNum(3,str2);
   var h2 = getNum(4,str2);
   var mu2 = getNum(5,str2);
   var s2 = getNum(6,str2);
   alert(y1+"-"+m1+"-"+d1+" " + h1 + ":"+mu1+":"+s1);
   var time1 = Date.UTC(y1,m1,d1,h1,mu1,s1);
   var time2 = Date.UTC(y2,m2,d2,h2,mu2,s2);
   alert(time1 > time2);
   if(time1 > time2){
    return false;
   }else {
    return true;
   
  }
  }
 
  function getNum(num,str){
      var str1 = str.split(" ");
   var date_str = str1[0].split("-");
   var time_str = str1[1].split(":");
   var return_value = "";
    //var
   switch(num){
    case 1:
       return_value = date_str[0];
       break;
       case 2:
       return_value = date_str[1];
       break;
       case 3:
       return_value = date_str[2];
       break;
       case 4:
       return_value = time_str[0];
       break;
       case 5:
       return_value = time_str[1];
       break;
       case 6:
       return_value = time_str[2];
       break;  
    default:
      break;
         }
   return return_value ;
  }

 

方法二：

function comptime(beginTime, endTime) {
 
     var beginTimes = beginTime.substring(0, 10).split('-');
     var endTimes = endTime.substring(0, 10).split('-');
 
     beginTime = beginTimes[1] + '/' + beginTimes[2] + '/' + beginTimes[0] + '/ ' + beginTime.substring(10, 19);
     endTime = endTimes[1] + '/' + endTimes[2] + '/' + endTimes[0] + '/ ' + endTime.substring(10, 19);
 
     var a = (Date.parse(endTime) - Date.parse(beginTime)) / 3600 / 1000;
 
     if (a <= 0) {
         return false;
     } else {
      return true;
     }
 }