How does the browser obtain the vue object

Vue is a popular JavaScript framework for building interactive web interfaces. Vue.js has some powerful features, such as data binding, componentized architecture and virtual DOM. During the development process, sometimes you need to obtain the Vue object. This article will introduce how to obtain the Vue object in the browser.

Vue.js is an open source JavaScript framework, used by introducing the Vue library. Starting from Vue.js 2.0, Vue has been divided into two versions, namely the full version and the lightweight version. The full version includes the compiler and runtime and can be used in the browser, while the lightweight version only includes the runtime and needs to be compiled with the compiler before use.

The method of obtaining the Vue object varies depending on the version used. Next, we will introduce how to obtain the objects of the full version of Vue and the lightweight version of Vue respectively.

Get the Vue full version object

If you are using the Vue full version, you can get the Vue object in the following way:

var vm = new Vue({  // 创建Vue实例
  el: '#app',  // 挂载元素
  data: {  // 数据源
    message: 'Hello Vue!',
  },
});

Through the above code, create a Vue instance and It is mounted to the element in the page, and then the Vue object can be referenced through the variable vm, for example:

console.log(vm.message); // 输出 'Hello Vue!'

In addition, you can also pass the global variable Vue Get the Vue object, for example:

console.log(Vue.version); // 输出当前Vue版本号

Get the Vue lightweight version object

If you are using the Vue lightweight version, you need to use a specific build tool (such as Webpack or Browserify) to compile. The method of obtaining the Vue lightweight version object is similar to the method of obtaining the full version object, as follows:

// 加载Vue库（生产环境）
import Vue from 'vue/dist/vue.runtime.min.js';

// 或者使用开发环境版本
import Vue from 'vue/dist/vue.runtime.js';

// 创建Vue实例
var vm = new Vue({
  data: {
    message: 'Hello Vue!',
  },
});

console.log(vm.message); // 输出 'Hello Vue!'

Through the above code, we first use the import statement to load the Vue library, and then create a Vue instance And reference the Vue object through the vm variable.

Summary

Through this article, you have learned how to get the Vue full version and Vue lightweight version objects in the browser. During the actual development process, you can choose to use the appropriate version according to your needs to quickly build efficient and elegant web applications.

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