您的逻辑颠倒了第一位，你必须从startDate构造一个新的日期，以比较今天的日期。另外，您将curDate设置为范围， $ scope.curDate = new Date（），但是您将它引用为 curDate 没有 $ scope 所以没有定义。最后，您还需要将 stateDate 和 endDate 转换为日期。否则你只是比较字符串。

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

 if（new Date（startDate）> new Date（endDate））{
 $ scope.errMessage ='结束日期应大于开始日期'; 
返回false; 
} 
 if（new Date（startDate）< curDate）{
 $ scope.errMessage ='开始日期不应该在今天之前。 
返回false; 
} 
}; 
 

工作示例： http://jsfiddle.net/peceLm14/

I am completely New to Angularjs and trying to validate 2 scenarios. I have 2 text boxes one with start date and the other with end date. I am checking

1. Show validation error on UI if start date is not greater than or equal to today. It should be today or any day after today.
2. Show validation error on UI if start date is greater than end date. End date should be greater than start date.

I tried the below code which did not work. Any suggestions please.

Html Code

<label for="endDate" class="control-label">Start Date:</label>
<div>
    <input type="text" class="form-control" 
           id="startDate" ng-model="startDate" />
</div>

<label for="text" class="control-label">End Date:</label>
<div>
    <input type="text" class="form-control" 
           id="endDate" ng-model="endDate" 
            ng-change='checkErr(startDate,endDate)' />

</div>

<span>{{errMessage}}</span>

js code

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

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

  };

• I have input type as text for both date controls.I am using bootstrap date picker.

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;
    }
};

Working example: http://jsfiddle.net/peceLm14/