模板和数据的基本运作流程如下:
用户请求应用起始页面
用户的浏览器向服务器发起一次http连接,然后加载index.html页面,这个页面包含了模板
angular被加载到页面中,等待页面加载完成,查找ng-app指令,用来定义模板的边界
angular遍历模板,查找指定和绑定关系,将触发一些列动作:注册监听器、执行一些DOM操作、从服务器获取初始化数据。最后,应用将会启动起来,并将模板转换成DOM视图
连接到服务器去加载需要展示给用户的其他数据
显示文本
一种使用{{}}形式,如{{greeting}} 第二种ng-bind="greeting"
使用第一种,未被渲染的页面可能会被用户看到,index页面建议使用第二种,其余的页面可以使用第一种
表单输入
复制代码 代码如下:
<html ng-app>
<head>
<title>表单</title>
<script type="text/javascript" src="/UploadFiles/2021-04-02/angular.min.js">
<script type="text/javascript">
function StartUpController($scope) {
$scope.funding = {startingEstimate:0};
computeNeeded = function() {
$scope.funding.needed = $scope.funding.startingEstimate * 10;
};
$scope.$watch('funding.startingEstimate',computeNeeded); //watch model的变化
}
</script>
</head>
<body>
<form ng-controller="StartUpController">
Starting: <input ng-change="computeNeeded()" ng-model="funding.startingEstimate"> //change的时候调用函数
Recommendation: {{funding.needed}}
</form>
</body>
</html>
在某些情况下,我们不想一有变化就立刻做出动作,而是要进行等待。例如:
复制代码 代码如下:
<html ng-app>
<head>
<title>表单</title>
<script type="text/javascript" src="/UploadFiles/2021-04-02/angular.min.js">
<script type="text/javascript">
function StartUpController($scope) {
$scope.funding = {startingEstimate:0};
computeNeeded = function() {
$scope.funding.needed = $scope.funding.startingEstimate * 10;
};
$scope.$watch('funding.startingEstimate',computeNeeded);//watch监视一个表达式,当这个表达式发生变化时就会调用一个回调函数
$scope.requestFunding = function() {
window.alert("Sorry,please get more customers first.")
};
}
</script>
</head>
<body>
<form ng-submit="requestFunding()" ng-controller="StartUpController"> //ng-submit
Starting: <input ng-change="computeNeeded()" ng-model="funding.startingEstimate">
Recommendation: {{funding.needed}}
<button>Fund my startup!</button>
</form>
</body>
</html>
非表单提交型的交互,以click为例
复制代码 代码如下:
<html ng-app>
<head>
<title>表单</title>
<script type="text/javascript" src="/UploadFiles/2021-04-02/angular.min.js">
<script type="text/javascript">
function StartUpController($scope) {
$scope.funding = {startingEstimate:0};
computeNeeded = function() {
$scope.funding.needed = $scope.funding.startingEstimate * 10;
};
$scope.$watch('funding.startingEstimate',computeNeeded);
$scope.requestFunding = function() {
window.alert("Sorry,please get more customers first.")
};
$scope.reset = function() {
$scope.funding.startingEstimate = 0;
};
}
</script>
</head>
<body>
<form ng-controller="StartUpController">
Starting: <input ng-change="computeNeeded()" ng-model="funding.startingEstimate">
Recommendation: {{funding.needed}}
<button ng-click="requestFunding()">Fund my startup!</button>
<button ng-click="reset()">Reset</button>
</form>
</body>
</html>
列表、表格以及其他迭代型元素
ng-repeat会通过$index返回当前引用的元素序号。 示例代码如下:
复制代码 代码如下:
<html ng-app>
<head>
<title>表单</title>
<script type="text/javascript" src="/UploadFiles/2021-04-02/angular.min.js">
<script type="text/javascript">
var students = [{name:'Mary',score:10},{name:'Jerry',score:20},{name:'Jack',score:30}]
function StudentListController($scope) {
$scope.students = students;
}
</script>
</head>
<body>
<table ng-controller="StudentListController">
<tr ng-repeat='student in students'>
<td>{{$index+1}}</td>
<td>{{student.name}}</td>
<td>{{student.score}}</td>
</tr>
</table>
</body>
</html>
隐藏与显示
ng-show和ng-hide功能是等价的,但是运行效果正好相反。
复制代码 代码如下:
<html ng-app>
<head>
<script type="text/javascript" src="/UploadFiles/2021-04-02/angular.min.js">
<script>
function DeathrayMenuController($scope) {
$scope.menuState = {show:false };//这里换成menuState.show = false 效果就显示不出来了。以后声明变量还是放在{}里面吧
$scope.toggleMenu = function() {
$scope.menuState.show = !$scope.menuState.show;
};
}
</script>
</head>
<body>
<div ng-controller='DeathrayMenuController'>
<button ng-click='toggleMenu()'>Toggle Menu</button>
<ul ng-show='menuState.show'>
<li ng-click='stun()'>Stun</li>
<li ng-click='disintegrate()'>Disintegrate</li>
<li ng-click='erase()'>Erase from history</li>
</ul>
</div>
</body>
</html>
css类和样式
ng-class和ng-style都可以接受一个表达式,表达式执行的结果可能是如下取值之一:
表示css类名的字符串,以空格分隔
css类名数组
css类名到布尔值的映射
代码示例如下:
复制代码 代码如下:
<html ng-app>
<head>
<style type="text/css">
.error {
background-color: red;
}
.warning {
background-color: yellow;
}
</style>
<script type="text/javascript" src="/UploadFiles/2021-04-02/angular.min.js">
<script>
function HeaderController($scope) {
$scope.isError = false;
$scope.isWarning = false;
$scope.showError = function() {
$scope.messageText = "Error!!!!"
$scope.isError = true;
$scope.isWarning = false;
}
$scope.showWarning = function() {
$scope.messageText = "Warning!!!"
$scope.isWarning = true;
$scope.isError = true;
}
}
</script>
</head>
<body>
<div ng-controller="HeaderController">
<div ng-class="{error:isError,warning:isWarning}">{{messageText}}</div>
<button ng-click="showError()">Error</button>
<button ng-click="showWarning()">Warning</button>
</div>
</body>
</html>
css类名到布尔值的映射
示例代码如下:
复制代码 代码如下:
<html ng-app>
<head>
<style type="text/css">
.selected {
background-color: lightgreen;
}
</style>
<script type="text/javascript" src="/UploadFiles/2021-04-02/angular.min.js">
<script>
function Restaurant($scope) {
$scope.list = [{name:"The Handsome",cuisine:"BBQ"},{name:"Green",cuisine:"Salads"},{name:"House",cuisine:'Seafood'}];
$scope.selectRestaurant = function(row) {
$scope.selectedRow = row;
}
}
</script>
</head>
<body>
<table ng-controller="Restaurant">
<tr ng-repeat='restaurant in list' ng-click='selectRestaurant($index)' ng-class='{selected: $index==selectedRow}'> //css类名到布尔值的映射,当模型属性selectedRow的值等于ng-repeat中得$index时,selectd样式就会被设置到那一行
<td>{{restaurant.name}}</td>
<td>{{restaurant.cuisine}}</td>
</tr>
</table>
</body>
</html>
AngularJS,语法
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这里面让他访问的是一个国服的战网网址,com.cn和后面的zh都非常明白地表明这就是国服战网。
而他在复制这个网址并且进行登录之后,确实是网易的网址,也就是我们熟悉的停服之后国服发布的暴雪游戏产品运营到期开放退款的说明。这是一件比较奇怪的事情,因为以前都没有出现这样的情况,现在突然提示跳转到国服战网的网址,是不是说明了简体中文客户端已经开始进行更新了呢?