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源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script src="https://cdn.staticfile.org/angular.js/1.4.6/angular.min.js"></script> </head> <body> <div ng-app="myApp" ng-controller="myCtrl"> <b>请输入姓名：</b><br> <b>姓：</b><input type="text" ng-model="lastName"><br> <b>名：</b><input type="text" ng-model="firstName"><br> <h1>{{ lastName + " " + firstName }}</h1> <h2>{{ getFullName() }}</h2> <h2 style='color:red'>{{ fullName }}</h2> </div> <script> var app = angular.module('myApp', []).controller('myCtrl', function($scope) { $scope.lastName = ""; $scope.firstName = ""; $scope.getFullName =function(){ return $scope.lastName + " " + $scope.firstName;} //监听lastName的变化，更新fullName $scope.$watch('lastName', function() { $scope.fullName = $scope.lastName + " " + $scope.firstName; }); //监听firstName的变化，更新fullName $scope.$watch('firstName', function() { $scope.fullName = $scope.lastName + " " + $scope.firstName; }); }); </script> </body> </html>
运行结果