您可以在 beforeMount 中调用此功能Vue组件的一部分：如下所示：

You can call this function in beforeMount section of a Vue component: like following:

 ....
 methods:{
     getUnits: function() {...}
 },
 beforeMount(){
    this.getUnits()
 },
 ......

工作小提琴： https://jsfiddle.net/q83bnLrx/1/

Vue提供不同的生命周期钩子：

There are different lifecycle hooks Vue provide:

我列出的几个是：

1. beforeCreate ：刚刚初始化实例后同步调用，数据阻塞之前ervation和event / watcher setup。


2. 创建：在创建实例后同步调用。在此阶段，实例已完成处理选项，这意味着已设置以下内容：数据观察，计算属性，方法，监视/事件回调。但是，安装阶段尚未开始，$ el属性尚不可用。


3. beforeMount ：在安装开始之前调用：渲染函数即将首次调用。


4. 已安装：刚安装实例后调用，其中el由新创建的 vm替换。$ el 。


5. beforeUpdate ：在重新呈现和修补虚拟DOM之前调用数据。


6. 更新：在数据更改后调用导致虚拟DOM重新渲染和修补。

1. beforeCreate: Called synchronously after the instance has just been initialized, before data observation and event/watcher setup.
2. created: Called synchronously after the instance is created. At this stage, the instance has finished processing the options which means the following have been set up: data observation, computed properties, methods, watch/event callbacks. However, the mounting phase has not been started, and the $el property will not be available yet.
3. beforeMount: Called right before the mounting begins: the render function is about to be called for the first time.
4. mounted: Called after the instance has just been mounted where el is replaced by the newly created vm.$el.
5. beforeUpdate: Called when the data changes, before the virtual DOM is re-rendered and patched.
6. updated: Called after a data change causes the virtual DOM to be re-rendered and patched.

您可以查看此处的完整列表。

You can have a look at complete list here.

您可以选择最适合您的挂钩，并将其挂钩以调用您的功能，如上面提供的示例代码。

You can choose which hook is most suitable to you and hook it to call you function like the sample code provided above.