AngularJS ng-app的自动加载与属性值

ng-app 指令用于告诉 AngularJS 应用当前这个元素是根元素，所有 AngularJS 应用都必须要要一个根元素。

使用ng-app来标记一个DOM结点，在网页加载完毕时会自动引导（自动初始化）应用程序。

ng-app可以带属性值，可以指定加载应用模块的名称，ng-app="模块名称"。

但是HTML文档中只允许有一个 ng-app 指令，如果有多个 ng-app 指令，则只有第一个会被使用。

所以想要实现自动加载，那么就不能让ng-app带有属性值，即不能指定载入应用模块名称。

正确写法

<bodyng-app>
<div><p>{{5+5}}</p></div>
<div><p>{{10+10}}</p></div>
</body>

只加载第一个块

<body>
<divng-app><p>{{5+5}}</p></div>
<divng-app><p>{{10+10}}</p></div>
</body>

以下为ng-app添加属性值的写法都是错误的，会报错

<bodyng-app=“myApp”>
<div><p>{{5+5}}</p></div>
<div><p>{{10+10}}</p></div>
</body>

<body>
<divng-app=“app1”><p>{{5+5}}</p></div>
<divng-app=“app2”><p>{{10+10}}</p></div>
</body>

带属性值时候需要手动加载对应ng-app

<body>
<divid="app1"ng-app="app1">{{5+5}}</div>
<divid="app2"ng-app="app2">{{10+10}}</div>
<scripttype="text/javascript">
varapp1=angular.module("app1",[]);
varapp2=angular.module("app2",[]);
angular.bootstrap(document.getElementById("app2"),['app2']);
</script>
</body>

app1会自动加载

app2需要手动加载

angular.bootstrap() ，手动启动 AngularJS

文档地址 https://docs.angularjs.org/api/ng/function/angular.bootstrap

angular.bootstrap(element, [modules], [config]);

Arguments

Param Type Details

element

Param	Type	Details
element	DOMElement	DOM element which is the root of angular application.
modules (optional)	Array<String\|Function\|Array>=	an array of modules to load into the application. Each item in the array should be the name of a predefined module or a (DI annotated) function that will be invoked by the injector as a `config` block. See: modules
config (optional)	Object	an object for defining configuration options for the application. The following keys are supported: `strictDi` - disable automatic function annotation for the application. This is meant to assist in finding bugs which break minified code. Defaults to `false`.

DOMElement

DOM element which is the root of angular application.

modules

(optional)

Array<String|Function|Array>=

an array of modules to load into the application. Each item in the array should be the name of a predefined module or a (DI annotated) function that will be invoked by the injector as a config block. See: modules

config

(optional)

Object

an object for defining configuration options for the application. The following keys are supported:

strictDi - disable automatic function annotation for the application. This is meant to assist in finding bugs which break minified code. Defaults to false.

element应该对应根ng-app的id，

modules 模块名数组

AngularJS ng-app的自动加载与属性值

Arguments

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