您已经扭转在第一位的逻辑，你必须从构建一个的startDate新的日期来比较今天的日期。你也设置为CURDATE范围， $ scope.curDate =新的日期（）但随后你被引用为 CURDATE 没有 $范围所以这是不确定的。最后，你需要投 stateDate 和结束日期来的日期为好。否则，你只是比较字符串。

You have the logic reversed on the first bit and you have to construct a new date from startDate to compare to today's date. Also you set curDate to the scope, $scope.curDate = new Date() but then you were referencing it as curDate without the $scope so it was undefined. Lastly, you need to cast stateDate and endDate to a date as well. Otherwise you're just comparing strings.

$scope.checkErr = function(startDate,endDate) {
    $scope.errMessage = '';
    var curDate = new Date();

    if(new Date(startDate) > new Date(endDate)){
      $scope.errMessage = 'End Date should be greater than start date';
      return false;
    }
    if(new Date(startDate) < curDate){
       $scope.errMessage = 'Start date should not be before today.';
       return false;
    }
};

的例子： http://jsfiddle.net/peceLm14/