使用Angular JS验证数字字段为0时的数值

angular.module('myApp', [])
  .directive('notZero', function() {
    return {
      require: 'ngModel',
      link: function(scope, element, attrs, ngModelCtrl) {
        ngModelCtrl.$validators.notZero = function(modelValue, viewValue) {
          if (ngModelCtrl.$isEmpty(modelValue)) {
            // 如果字段为空，则认为有效
            return true;
          }
          // 检查值是否不为0
          return modelValue !== 0;
        };
      }
    };
  });

<form name="myForm">
  <input type="number" name="myNumber" ng-model="user.number" not-zero required />
  <span ng-show="myForm.myNumber.$error.notZero">数字不能为0</span>
  <span ng-show="myForm.myNumber.$error.required">这是必填项</span>
</form>