Summary of FAQs and usage tips in Vue

Vue.js is a front-end framework. Its biggest advantage is its responsive data binding mechanism and simple and elegant API design, which is one of the reasons why it is widely used. With the popularity of Vue, developers have also encountered some problems and challenges. Below we will summarize the common problems and usage tips in Vue.

1. Frequently Asked Questions

1. How to use Vue.js?

Vue.js can be used by directly introducing the Vue.js file, but In a production environment, we can install Vue.js via npm. The specific steps are as follows:

1.使用命令行进入到项目根目录，通过命令npm init -y生成package.json

2.通过命令npm install vue安装Vue.js

3.在需要使用Vue.js的地方，通过import Vue from 'vue'引入Vue.js

2. How is the responsive management of Vue.js implemented?

The responsive management of Vue.js needs to rely on the Object.defineProperty() method . In Vue, all data will be monitored by the framework. When the data changes, Vue will change the data through getter/setter methods and also update the view.

3. How to build components using Vue.js?

In Vue.js, developers can define components through the Vue.component() method. For example:

Vue.component('my-component', {
template: '

A custom component!

'
})

Reference the component in other Vue instances in the following way:

4. How to interact with data in Vue.js?

Vue.js provides an Ajax implementation based on XHR, and developers can implement data interaction through the $http object. The usage is as follows:

this.$http.get('/user').then(response => {

console.log(response.body);

}, error => {

console.error(error);

});

2. Summary of Vue usage skills

1. When Vue.js uses HTML template rendering, use the v-if directive to achieve conditional rendering

For example:

This is shown only when isShow is true.

2. Vue.js You can also use the v-for directive to implement loop rendering

For example:

• {{ item }}

3. You can use the $nextTick function in the Vue declaration cycle method to ensure that Vuejs has updated the DOM before performing the operation

For example:

Vue.nextTick(function () {
// DOM updated
})

Call $nextTick in the parent component to ensure All subcomponents have been rendered.

4. Vue.js provides two methods, computed and watch, to respond to data changes.

Computed is mainly used to calculate responsive data. The specific usage is as follows:

computed: {
fullName: function () {

return this.firstName + ' ' + this.lastName;

}
}

watch is mainly used to perform corresponding operations on changes in data. The specific usage is as follows ：

watch: {
firstName: function (val) {

this.fullName = val + ' ' + this.lastName;

}
}

Through the above summary, we can better understand Vue. The data binding mechanism and usage of js can not only develop faster, but also solve problems better.

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