ng-dirty,ng-valid,ng-pristine,ng-touched,ng-valid-minlength,ng-valid-parse等表示什么?
向幕友们请教:ng-pristine,ng-dirty,ng-valid-parse,ng-touched,ng-untouched,ng-valid,ng-invalid,ng-valid-minlength,ng-valid-maxlength,ng-invalid-minlength,ng-invalid-maxlength分别是什么意思啊?求详细解释。