代码块

 1     var aStr = "2015-02-22".split("-");
 2     var aEnd = "2015-03-22".split("-");
 3 
 4     var arr = [aStr,aEnd];
 5 
 6     arr.sort(function(a1,a2){
 7         for(var i=0; i<a1.length; i++){
 8             if((a1[i]-a2[i])!=0)return a1[i] - a2[i];
 9         }
10         return 0;
11     })
12     console.log(arr[0].join("-"));//输出小的日期

1     var aStr = "2015-02-22".split("-").join("");
2     var aEnd = "2015-03-22".split("-").join("");
3     //比较
4     parseInt(aStr)-parseInt(aEnd);