> For the complete documentation index, see [llms.txt](https://xiaoxiami.gitbook.io/angularjs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xiaoxiami.gitbook.io/angularjs/shu_ju_bang_ding/shu_ju_dao_mo_ban.md).
# 控制器->模板->控制器->模板
数据到模板的绑定，主要是使用模板标记直接完成的。 模板到数据的绑定，主要是通过 ng-model 来完成的。
使用 `{{ }}`这个标记，就可以直接引用，并绑定一个作用域内的变量。在实现上， ng 自动创建了一个 watcher 。效果就是，不管因为什么，如果作用域的变量发生了改变，我们随时可以让相应的页面表现也随之改变。我们可以看一个更纯粹的例子：
**index.html**
```markup
```
**app/index.js**
```javascript
var app = angular.module('myApp', []);
app.controller('firstController', function($scope){
// $scope 我们叫做作用域
// 申明一个Model
$scope.name = '张三';
$scope.age = 20;
});
```
**注意上述代码：**
```
{{name}}
{{age}}
```
如果当网络慢时，页面还未渲染，页面将会直接显示上述内容。 所以需要使用ng-bind指令。 上述内容替换为
```markup
```
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