angularjs中的$ ctrl是什么?什么时候在视图上使用$ ctrl vs $ scope? [英] What are $ctrl in angularjs? when to use $ctrl vs $scope on view?
问题描述
例如，在视图上使用$ctrl
<b>Heroes</b><br>
<hero-detail ng-repeat="hero in $ctrl.list"
hero="hero"
on-delete="$ctrl.deleteHero(hero)"
on-update="$ctrl.updateHero(hero, prop, value)">
</hero-detail>
何时使用$ctrl和何时使用$scope与视图进行交互?
When to use $ctrl and when to use $scope for interacting with view?
https://docs.angularjs.org/guide/component
推荐答案
在视图中，您可以将别名绑定到控制器，从而轻松引用$scope变量.
当您嵌套controllers and you dont want to reference something from a different controller. since $ scope`遵循分层数据结构时，这很有用.
in views you can bind an alias to your controller making it easy to reference $scope variables.
this is usefull when you nest controllers and you dont want to reference something from a different controller. since$scope` follows hierarchial data structure.
因此，为了确定控制器的范围，可以使用此语法.
so in order to scope your controller you can use this syntax.
例如，有两个控制器，两个控制器都具有相同的变量名称"，您可以执行以下操作:
For example, having two controllers, both with the same a variable 'name', You can do this:
<body ng-controller="ParentCtrl as ptr">
<input ng-model="name" /> {{ptr.name}}
<div ng-controller="ChildCtrl as chl">
<input ng-model="name" /> {{chl.name}} - {{ptr.name}}
</div>
这使得引用范围变量变得容易.
this makes it easy to reference the scope variables.
<b>Heroes</b><br>
<hero-detail ng-repeat="hero in $ctrl.list"
hero="hero"
on-delete="$ctrl.deleteHero(hero)"
on-update="$ctrl.updateHero(hero, prop, value)">
</hero-detail>
如果使用的是components，则在angulajs1.5后面的$ctrl，当然您可以覆盖它.
after angulajs1.5 in angular if you are using components its default alias is $ctrl and ofcourse you can override it.
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