<!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;
});
});
时间： 2024-11-04 18:22:00