双向绑定
双向绑定是angularJS的重要特性,也就是数据影响视图,视图也会影响数据。
一个M影响V最简单的示例就是这样:
<div ng-controller="CounterCtrl"> <span ng-bind="counter"></span> <button ng-click="counter++">increase</button> </div> function CounterCtrl($scope) { $scope.counter = 1; }
这个例子很简单,毫无特别之处,每当点击一次按钮,界面上的数字就增加一。
下面,我们举一个V影响M的例子:
<!DOCTYPE html> <html ng-app> <head> <meta charset="utf-8"> <title>ng-model directive</title> </head> <body ng-controller="HelloController"> <div> <p>双向绑定</p> <input ng-model="greeting"> <p>Hello {{greeting || "World"}}</p> <button ng-click="init()">重置</button> <hr> </div> <script src="../lib/angularjs/1.2.26/angular.min.js"></script> <script> function HelloController($scope) { $scope.init = function() { $scope.greeting = "Hello"; } } </script> </body> </html>