How to intercept vue rendering

With the widespread application of Vue and more and more front-end engineers understanding and mastering Vue, Vue's rendering mechanism has become more and more important. Rendering is the core of a Vue application, it is the process of binding data to views.

However, in the actual development process, we may need to intercept Vue rendering to optimize performance or process data. This article will introduce some methods to help readers understand how to intercept the rendering process in Vue.

1. Using computed properties

The computed property (computed) in Vue is a property that can be calculated based on other properties. When the data that the computed attribute depends on changes, it is recalculated. We can use the computed attribute to intercept Vue's rendering process.

The steps are as follows:

(1) Define a computed attribute in the Vue instance

computed: {
  computedData() {
    // 在这里进行数据的处理或者其他操作
    return this.originalData
  }
}

(2) Use computedData in the template instead of the original data

<div>{{computedData}}</div>

Through this method, we can process the data in the computed attribute, and then pass the processed data to the template for rendering.

2. Using watcher

The watch in Vue is a tool that monitors property changes and responds. It can be used to intercept the rendering process of Vue.

The steps are as follows:

(1) Define a watch in the Vue instance

watch: {
  originalData(newVal, oldVal) {
    // 在这里进行数据的处理或者其他操作
    this.processedData = newVal
  }
}

(2) Use the data to which the watch belongs in the template

<div>{{processedData}}</div>

Through this method, we can process the data in the watch, and then pass the processed data to the template for rendering.

3. Using mixins

The mixin in Vue is a way to reuse component options, which can be used to intercept the rendering process of Vue.

The steps are as follows:

(1) Define a mixin

const myMixin = {
  computed: {
    computedData() {
      // 在这里进行数据的处理或者其他操作
      return this.originalData
    }
  }
}

(2) Apply the mixin to the component

Vue.component('my-component', {
  mixins: [myMixin],
  data() {
    return {
      originalData: 'hello world',
    }
  },
  template: '<div>{{computedData}}</div>'
})

In this method, we define A mixin is created, and the computed attribute is defined in the mixin to process data. Then apply this mixin to the component so that the component can use the computed property to process the data.

4. Using the render function

The rendering function in Vue is a method of writing templates in function coding, which can be used to intercept the rendering process of Vue.

The steps are as follows:

(1) Define the render function

Vue.component('my-component', {
  props: ['data'],
  render(h) {
    // 在这里进行数据的处理或者其他操作
    return h('div', this.data)
  }
})

(2) Use the component in the template and the data passed to the component

<my-component :data="originalData"></my-component>

Pass With this method, we can process the data in the render function, and then pass the return value of the rendering function to the template for rendering.

Summary

There are many ways to intercept the Vue rendering process. You can choose the appropriate method according to specific scenarios and needs. The four methods introduced above can well intercept the Vue rendering process, and have the characteristics of simple operation and obvious effects, and can be widely used in actual development.

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