How to use vue.js to make asynchronous requests

How to use vue.js to make asynchronous requests: first install axiox in the project; then introduce axiox in main.js for global use; then make an axios get request; and finally implement axios post request. .

The operating environment of this tutorial: windows7 system, vue2.0 version, thinkpad t480 computer.

Recommended: "vue tutorial"

Use vue.js to make asynchronous requests

1. Axios implements asynchronous requests

1. Install axiox in the project

npm install --save axios

2.Introduce it in main.js for global use

import axios from 'axios'
//可以给axios的ajax请求设置统一的主机和端口号
axios.defaults.baseURL = "http://157.122.54.189:8080/";
//将axios这个对象添加到Vue的原型对象中，在使用的时候就只需要使用this.对象名就可以了
Vue.prototype.$http = axios

3.axios get request

vue Front-end:

<template>
 <div>
 </div>
</template>
<script>
export default {
  methods:{
   getData(){
   //axios-get请求
   this.$http.get(&#39;/getData1&#39;)
         .then(r => console.log(r))//接口调用成功返回的数据
         .catch(err => console.log(err)),//接口调用失败返回的数据
    }
  }
  mounted(){//模板或el对应的html渲染完成后再调用里面的方法
 this.getData()
  }
}
</script>
<style scoped>
</style>
node后端：
server.get(&#39;/getData1&#39;,function(req,res){
  res.send({
    &#39;msg&#39;:&#39;aaa&#39;
  })
})

Request result:

4.axios post request

Vue front-end:

Submit parameters Two forms:

// 1.可以直接传入字符串 name=张三&age=19
// 2.可以以对象的形式传入{name:“三”,age:19}
<template>
 <div>
 </div>
</template>
<script>
export default {
  methods:{
   getData(){
   //axios-post请求传值
      this.$http({
          method:"post",
          url:"/getData2",
          headers:{
              &#39;Content-type&#39;: &#39;application/x-www-form-urlencoded&#39;
          },
          data:{
              name:&#39;xxx&#39;
          },
          transformRequest: [function (data) {//更改传值格式
              let ret = &#39;&#39;
              for (let it in data) {
                ret += encodeURIComponent(it) + &#39;=&#39; + 
                encodeURIComponent(data[it]) + &#39;&&#39;
              }
              return ret.slice(0,ret.length-1)
            }],
      })
        .then(r => console.log(r))
        .catch(err => console.log(err))
    }
  }
  mounted(){//模板或el对应的html渲染完成后再调用里面的方法
 this.getData()
  }
}
</script>
<style scoped>
</style>

node backend:

server.post('/getData2',function(req,res){
  req.on("data",function(data){
      console.log(querystring.parse(decodeURIComponent(data)));
  });
  res.send({
    'msg':'bbb'
  })
})

2. vue-resource implements asynchronous requests (basically the same steps as axios)

1. Install vue in the project -resource

npm install --save vue-resource

2.Introduced in main.js for global use

import vueResource from 'vue-resource'
Vue.use(vueResource)//这儿有所不同

3.vue-resource get request

this.$http.get('/getData1')
    .then(r => console.log(r))//接口调用成功返回的数据
    .catch(err => console.log(err)),//接口调用失败返回的数据

4.vue-resource post Request

this.$http.post('/getData2',{name:"bbb"})
    .then(r => console.log(r))//接口调用成功返回的数据
    .catch(err => console.log(err)),//接口调用失败返回的数据

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