angularjs - Controller 与指令的区别以及何时使用？

Question

我正在努力理解 Controller 的目的是什么。我知道这是您引用事物的方式，但是由于您可以将其放入指令中，因此是否存在过一种情况，您希望将 ng-controller 用于 html 中的特定部分，而不是创建具有内置 Controller 的指令在？

Answer 1

is there ever a scenario where you would want to use ng-controller for a specific section in your html rather than creating a directive that has a controller built in?

是的，绝对是的。

当目标是操作 DOM 时使用指令。

当您想要创建可重用组件时，请使用指令。

当您只需要将值绑定(bind)到 DOM 时，请使用 Controller 。

对于这两种方法中的任何一种，可能还有一百种其他情况，但我相信这应该足以证明使用其中一种方法是合理的。
至于两者之间的区别，请查看@yvesmancera 已经指出您的问题( angularjs-directives-vs-controllers)。

In Angular, a Controller is defined by a JavaScript constructor function that is used to augment the Angular Scope.

When a Controller is attached to the DOM via the ng-controller directive, Angular will instantiate a new Controller object, using the specified Controller's constructor function. A new child scope will be created and made available as an injectable parameter to the Controller's constructor function as $scope.

At a high level, directives are markers on a DOM element (such as an attribute, element name, comment or CSS class) that tell AngularJS's HTML compiler ($compile) to attach a specified behavior to that DOM element or even transform the DOM element and its children.