angular 基于ng-messages的表单验证实例

 <div class="form-group" ng-class="{'has-error': myForm.myName.$touched && myForm.myName.$invalid}">  <label class="col-xs-2 control-label">name</label>  <div class="col-xs-6">    <input type="text" class="form-control" name="myName" ng-model="formData.username"        placeholder="2-10个中英文字符，aaa会重名，必填"        name-check minlength="2" maxlength="10" required>  </div>  <div class="col-xs-4 form-control-static text-danger" ng-messages="myForm.myName.$error"           ng-messages-include="demos/form/error.html" ng-show="myForm.myName.$touched">  </div></div>

<span ng-message="required">必填</span><span ng-message="char">非法字符</span><span ng-message="exist">名称已存在</span><span ng-message="minlength">太短了</span>

app.directive('nameCheck', nameCheck);nameCheck.$inject = ['HttpService', '$q'];function nameCheck(HttpService, $q){  var NAME_REG = /^[a-zA-Z/u4e00-/u9fa5]+$/;  return {    restrict: 'A',    require: 'ngModel',    link:function($scope,element,attrs,ctrl){      ctrl.$validators.char = function(modelValue, viewValue) {        var value = modelValue || viewValue;        if(!NAME_REG.test(value)){          return false;        }        return true;      };      ctrl.$asyncValidators.exist = function(modelValue, viewValue){        var value = modelValue || viewValue;        var deferred = $q.defer();        HttpService.get('api/users/' + value).then(function(res) {          if(res.isExist){            deferred.reject(false);          }          deferred.resolve(true);        })        return deferred.promise;      }    }  }}