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<!DOCTYPE html> <html> <script src="https://cdn.staticfile.net/angular.js/1.6.9/angular.min.js"></script> <body ng-app="myApp"> <p>请试着在输入框中输入内容：</p> <form name="myForm"> <input name="myInput" ng-model="myInput" required my-directive> </form> <p>输入框的有效状态是：</p> <h1>{{myForm.myInput.$valid}}</h1> <script> var app = angular.module('myApp', []); app.directive('myDirective', function() { return { require: 'ngModel', link: function(scope, element, attr, mCtrl) { function myValidation(value) { if (value.indexOf("e") > -1) { mCtrl.$setValidity('charE', true); } else { mCtrl.$setValidity('charE', false); } return value; } mCtrl.$parsers.push(myValidation); } }; }); </script> <p>输入框必须包含字符“e”才能被视为有效。</p> </body> </html>