Location requirements for methods executed after vue is mounted

In Vue development, we often use mounting hook functions to perform some operations after component initialization is completed. However, you may find that in Vue's mounting hook function, there are certain requirements for the location of the method to be executed. This article will introduce in detail the location requirements for the method to be executed after Vue is mounted.

First, let’s take a look at the mounting hook function in Vue. Vue provides multiple life cycle hook functions, including mounting hook functions. We can implement the mounting function by defining the mounte function in the component. The specific code is as follows:

mounted(){
  //组件挂载后执行的代码
}

This mounted function is the mounting hook function in Vue. We can write some initialization code in this hook function, such as requesting asynchronous data through ajax, initializing some state variables, etc.

So, what are the location requirements for methods to be executed after Vue is mounted?

To understand the location requirements of methods executed after Vue is mounted, we need to know some concepts first. In Vue single-file components, there are usually three parts: template, script and style. Among them, template is the template part of the component, which is the DOM structure we see on the page; script is the logical part of the component, which means we wrote business logic and Vue-related code; style is the style part of the component, that is We wrote code related to component styles.

The mounting sequence of Vue components is: first instantiate the component object, before executing the mounting hook function, first execute some internal life cycle functions, and finally execute the mounting hook function, that is, we write mounted function. Therefore, in Vue, before executing the mounting hook function, we usually need to initialize the state variables and other information of the component object. This information is usually defined in the initial data of the component. In other words, if we need to call these state variables in the mounting hook function, then these state variables need to be defined before the component is instantiated, otherwise we will encounter exception information such as undefined when calling.

It should be noted that if other component methods are called in the mounting hook function, these component methods also need to be defined before the component is instantiated. Otherwise, you will also encounter exception information such as undefined.

To sum up, the location requirement of the method executed after Vue is mounted is to define the state variables and other component methods that need to be called before the component is instantiated. Otherwise, you may encounter undefined and other exceptions when calling. information. This is the method location requirement for execution after Vue is mounted.

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