In-depth discussion on how to execute Vue page after loading

Vue is a popular JavaScript framework for building dynamic web applications. There are many life cycle hook functions in Vue that can help us manage various stages of the application. This article will focus on the method of executing the Vue page after loading.

In Vue, there is a life cycle hook function called created, which will be executed immediately after the Vue instance is created. However, sometimes we need to execute some code after the Vue component is fully loaded and ready. This requires the use of another hook function provided by Vue: mounted.

The mounted hook function is executed after the Vue instance is mounted on the DOM element. This indicates that the Vue component is ready and can interact with DOM elements. In the mounted hook function, we can perform some operations that interact with the DOM, such as binding events, obtaining element attributes, etc.

Here is an example:

<template>
  <div>
    <h1>Vue页面加载完执行的方法示例</h1>
    <p>{{ message }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      message: 'Hello Vue!',
    };
  },

  mounted() {
    console.log('Vue组件已经准备就绪');
  },
};
</script>

In the above code, we create a Vue component and print a message in the mounted hook function. When this component is mounted on the DOM element, "Vue component is ready" will be output on the console.

It should be noted that there is no guarantee that all sub-components are ready in the mounted hook function. If you need to execute some code after all child components are ready, you can use another method provided by Vue: $nextTick.

$nextTick method can accept a callback function as a parameter, which will be executed after all sub-components have been rendered. As follows:

<template>
  <div>
    <h1>Vue页面加载完执行的方法示例</h1>
    <p v-if="showMessage">{{ message }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      message: 'Hello Vue!',
      showMessage: false,
    };
  },

  mounted() {
    this.showMessage = true;

    this.$nextTick(() => {
      console.log('子组件已经准备就绪');
    });
  },
};
</script>

In the above code, we set the showMessage property to true in the mounted hook function, and use the $nextTick method to output a message after all child components have been rendered.

In actual development, we can use the mounted hook function to perform some initialization operations, such as requesting data, initializing status, etc. If you need to perform some operation that can only be performed after the component is fully ready, you can use the $nextTick method.

In short, Vue provides many life cycle hook functions to help us manage various stages of components. When you need to perform some operations, you should choose an appropriate hook function to implement it. The mounted hook function is the best place to execute code after the Vue component is mounted.

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