A brief analysis of the implementation methods of Vue public methods

Vue is a popular JavaScript framework that developers can use to quickly build user interfaces. In Vue, public methods are a very important part. This article will introduce Vue public methods.

In Vue, public methods can be global methods or instance methods. Global methods are methods mounted on the Vue object and can be called in any Vue instance. Instance methods are methods mounted on the Vue instance and can only be called in the current instance.

The easiest way to define global methods in Vue is to use the prototype of the Vue object. This prototype object can be added before or after Vue initialization, as shown below:

// 在Vue初始化之前添加原型方法
Vue.prototype.sayHello = function() {
  console.log('Hello, Vue!');
}

// 在Vue初始化之后添加原型方法
var vm = new Vue({
  el: '#app',
  mounted: function() {
    Vue.prototype.sayHello();
  }
});

// 输出结果：Hello, Vue!

In this example, we add a method named sayHello to the Vue prototype, and then we call it , output a greeting.

In addition to using the Vue prototype to add global methods, we can also use Vue.mixin() to add a group of methods as global methods. This can be done by sharing a set of methods across multiple Vue components, like this:

// 定义一个名为myMixin的对象
var myMixin = {
  methods: {
    sayHello: function() {
      console.log('Hello, Vue!');
    }
  }
}

// 使用Vue.mixin()添加myMixin对象为全局方法
Vue.mixin(myMixin);

// 在Vue实例中调用sayHello方法
var vm = new Vue({
  el: '#app',
  mounted: function() {
    this.sayHello();
  }
});

// 输出结果：Hello, Vue!

In this example, we define a JavaScript object named myMixin that contains a sayHello method. We then add this object as a global method using Vue.mixin(). Finally, we call the sayHello method in the Vue instance to output a greeting.

In addition to global methods, Vue also supports instance methods. These methods can be added to a Vue instance and can only be called within this instance. We can use the Vue.extend() method to create a subclass with a custom method and then instantiate it in a Vue instance.

The following is an example of using the Vue.extend() method to create an instance method:

// 定义一个名为myMixin的子类
var myMixin = Vue.extend({
  methods: {
    sayHello: function() {
      console.log('Hello, Vue!');
    }
  }
});

// 在Vue实例中实例化myMixin
var vm = new myMixin({
  el: '#app',
  mounted: function() {
    this.sayHello();
  }
});

// 输出结果：Hello, Vue!

In this example, we define a subclass named myMixin , contains a method named sayHello. Then, we instantiate myMixin in the Vue instance and call the sayHello method in the mounted life cycle hook.

The parameters of Vue's public methods can be any parameter type supported by JavaScript functions, such as strings, numbers, objects, and functions. If you are new to Vue development, be sure to have a certain understanding of the syntax and writing parameters of Vue's public methods. This will help you better master the basic knowledge of the Vue framework.

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