angularjs ng-app

最新推荐文章于 2025-08-15 09:01:53 发布

转载最新推荐文章于 2025-08-15 09:01:53 发布 · 130 阅读

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#javascript #ViewUI

本文通过三个实例介绍AngularJS的基本用法，包括使用ng-app初始化应用、ng-controller控制器更新视图数据、ng-model实现输入框与数据双向绑定及利用$watch监听数据变化实现自动更新。

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<!DOCTYPE HTML>
<html ng-app>    //ng-app是初始化指令，整个页面都会被angularjs解析，写在div或者其他标签上表示只是局部的div和标签里面使用angularjs解析，其余的不用anguarjs解析。
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script src="angular.min.js"></script>
<script>

function Aaa($scope,$timeout){
    $scope.name = 'hello';
    setTimeout(function(){
        $scope.name = 'hi';//setTimeout这个定时器不能刷新name的值
    },2000);
    $timeout(function(){
        $scope.name = 'hi';//$timeout是angularjs的定时器才能使name值刷新
    },2000);
    
    $scope.show = function(){
        $scope.name = 'hi';
    };
    
}

</script>
</head>

<body>
//ng-controller是控制器
<div ng-controller="Aaa" ng-click="name='hi'">  click函数改变name的值
<div ng-controller="Aaa" ng-click="show()">     作用同上
    <p>{{name}}</p>
</div>

</body>
</html>

<!DOCTYPE HTML>
<html ng-app>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script src="angular.min.js"></script>
<script>

function Aaa($scope,$timeout){
    $scope.name = 'hello';
}
</script>
</head>

<body>
<div ng-controller="Aaa">
    <input type="text" ng-model="name">    输入框改变标签p也改变。
    <p>{{name}}</p>
</div>
</body>
</html>

<!DOCTYPE HTML>
<html ng-app>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script src="angular.min.js"></script>
<script>

function Aaa($scope,$timeout){
    $scope.iphone = {
        money : 5,
        num : 1,
        fre : 10
    };
    $scope.sum = function(){
        return $scope.iphone.money * $scope.iphone.num;
    };
    
    /*$scope.$watch('iphone.money',function(newVal,oldVal){
        console.log(newVal);
        console.log(oldVal);
    },true);*/
    
    $scope.$watch($scope.sum,function(newVal,oldVal){ //$watch监听数据的变化
        //console.log(newVal);
        //console.log(oldVal);
        $scope.iphone.fre = newVal >= 100 ? 0 : 10;
    });
}

</script>
</head>

<body>

<div ng-controller="Aaa">
    <p>价格:<input type="text" ng-model="iphone.money"></p>
    <p>个数:<input type="text" ng-model="iphone.num"></p>
    <p>费用:<span>{{ sum() | currency:'￥' }}</span></p>  currency是过滤器
    <p>运费:<span>{{iphone.fre | currency:'￥'}}</span></p>
    <p>总额:<span>{{ sum() + iphone.fre | currency:'￥'}}</span></p>
</div>

</body>
</html>