<!DOCTYPE html5> <html> <head> <title>AngularJs的练习</title> <meta charset="UTF-8"/> <link rel="stylesheet" href="css/3.css"/> </head> <body ng-app="myModule1"> <h1>AngularJs中关于数据绑定</h1> <h3>初识双向数据绑定</h3> <label for="uname">单价：</label><input type="text" id="uname" ng-model="price"/> <label for="num">数量：</label><input type="text" id="num" ng-model="count"/> <span>小计：{{ price*count }}</span> <hr/> <h3>$watch的练习</h3> <div ng-controller="myCtrl1"> <label for="uname">单价：</label><input type="text" id="uname" ng-model="price"/> <label for="num">数量：</label><input type="text" id="num" ng-model="count"/> <span>小计：{{ sum }}</span><!--此处的sum是mode->view的单向绑定，故需要$watch监听完成所需功能--> </div> <script src="js/angular.js"></script> <script src="js/3.js"></script> </body> </html>
对应的Js:
angular.module('myModule1',[])
.controller('myCtrl1',function($scope){
$scope.price=0;
$scope.count=0;
$scope.sum=$scope.price*$scope.count;
// $watch函数返回一个注销监听的函数
$scope.$watch('price',function(newVal,oldVal){
$scope.sum=newVal*$scope.count;//当价格发生变化时，更新sum
});
$scope.$watch('count',function(newVal,oldVal){
$scope.sum=newVal*$scope.price;
});
});