Vue cross-domain solution

In the vue project, when the front-end and back-end perform data requests or submissions, if the back-end does not set cross-domain settings, the front-end will report "No 'Access-Control-Allow-Origin' header is present on the" when debugging the code locally. requested resource." This cross-domain error.

If you want to debug normally locally, there are three solutions:

1. Change the header in the background

header('Access-Control-Allow-Origin:*');//允许所有来源访问  
header('Access-Control-Allow-Method:POST,GET');//允许访问的方式 　　

This way you can request data across domains.

2. Use jsonp provided by JQuery (Note: jquery is introduced in vue and Baidu is used by Baidu)

##

methods: {  
  getData () {  
    var self = this  
    $.ajax({  
      url: 'http://f.apiplus.cn/bj11x5.json',  
      type: 'GET',  
      dataType: 'JSONP',  
      success: function (res) {  
        self.data = res.data.slice(0, 3)  
        self.opencode = res.data[0].opencode.split(',')  
      }  
    })  
  }  
}

This method can also solve cross-domain problems question.

3. Use http-proxy-middleware proxy solution (the project is built using vue-cli scaffolding)

For example, the requested url: "http://f.apiplus.cn/bj11x5.json "

1. Open config/index.js and add the following code in proxyTable:

proxyTable: {  
  '/api': {  //使用"/api"来代替"http://f.apiplus.c"  
    target: 'http://f.apiplus.cn', //源地址  
    changeOrigin: true, //改变源  
    pathRewrite: {  
      '^/api': 'http://f.apiplus.cn' //路径重写  
      }  
  }  
}

2. Use it directly when requesting data using axios" /api”:

getData () {  
 axios.get('/api/bj11x5.json', function (res) {  
   console.log(res)  
 })

Use this method to solve cross-domain problems. If you still use this method when packaging and deploying, problems will arise. The solution is as follows:

let serverUrl = '/api/'  //本地调试时  
// let serverUrl = 'http://f.apiplus.cn/'  //打包部署上线时  
export default {  
  dataUrl: serverUrl + 'bj11x5.json'  
}

Define a serverUrl to replace our "/api" during debugging. When packaging, you only need to replace "http://www.xxx. com" to replace this "/api".

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