What should we pay attention to in vue2.0 axios cross-domain and rendering?

This time I will bring you what you need to pay attention to in vue2.0 axios cross-domain and rendering. What are the notes in vue2.0 axios cross-domain and rendering. The following is a practical case. Let’s take a look. take a look.

(Scaffolding vue-cli used)

Step one: Use the following statement in main.js

import axios from
'axios';
Vue.prototype.$axios=axios;

Then in other vue components, you can call this.$axios and use

Step 2: Configure proxyTable in webpack (index.js under config )

dev:
 { 
加入以下
proxyTable:
{
'/api':
{
target:
'http://api.douban.com',//设置你调用的接口域名和端口号
 别忘了加http 
changeOrigin:
true,
pathRewrite:
 { 
'^/api':
'/'//这里理解成用‘/api'代替target里面的地址，后面组件中我们掉接口时直接用api代替
 
比如我要调用'http://api.douban.com/v2/movie/top250'，直接写‘/api/v2/movie/top250'即可
}
}
},

Step Three:

Try it, the cross-domain is successful, but please note, this is just The cross-domain problem is solved in the development environment (dev). If it is actually deployed on the server in the production environment, there will still be cross-domain problems if it is not from the same origin. For example, the server port we deployed is 3001, which requires joint debugging of the front and back ends. The first step is for the front end. It can be tested separately in production and development environments. In config/dev.env.js and prod.env.js, that is, in the development/production environment, configure the requested address API_HOST respectively. In the development environment, we use the above configuration. The proxy address api, the normal interface address is used in the production environment, so configure it like this

module.exports = merge(prodEnv, {
 NODE_ENV: '"development"',//开发环境
 API_HOST:"/api/"
})

module.exports = {
 NODE_ENV: '"production"',//生产环境
 API_HOST:'"http://api.douban.com"'
}

Of course, you can directly request http://api.douban.com regardless of the development or production environment. After configuration, the program will automatically determine whether it is a development or production environment during testing, and then automatically match API_HOST. We can use process.env.API_HOST in any component to use the address such as

instance.post(process.env.API_HOST+'user/login', this.form)

and then after the second step The end server can configure cros cross-domain, which is access-control-allow-origin: * means allowing all access. To sum up: In the development environment, our front-end can configure a proxy to cross-domain. In a real production environment, we need the cooperation of the back-end. A certain expert said: This method is not easy to use in IE9 and below. If compatibility is required, the best way is to add a proxy to the server port on the backend. The effect is similar to the webpack proxy during development.

Step 4:

<template>
<p>
  <ul>
    <li v-for="item in movieArr">
      <span>{{item.title}}</span>
    </li>
  </ul>
  <button @click="sayOut">渲染</button>
</p>
</template>
<script>
export default {
 data () {
  return {
    movieArr : []
  }
 },
 methods: {
   sayOut () {
     this.$axios.get('/api/v2/movie/top250')
    .then((response) => {
       console.log(response.data.subjects)
       this.movieArr = response.data.subjects // 这里要强调一下这个this 箭头函数指的是它的父级也就是vue实例 然后不用箭头函数的话 this是一个undefined 无法.movieArr来给他赋值 这里要注意一下 我被坑了半天 希望小伙伴不要被坑
    })
   }
 }
}
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
</style>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related matters on the php Chinese website article!

Recommended reading:

How to use vue2.0axios cross-domain and rendering

How to drag images freely with Vue.js move

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