Note vue using ajax (2) vue in

vue Note (1): https://blog.csdn.net/qq_43537987/article/details/93402865

Vue utilized vue-resource request initiated Ajax

  • In addition vue-resource, you may be used axiosto third packet to fulfill the request for data

Reference website:

https://www.runoob.com/vue2/vuejs-ajax.html

https://github.com/pagekit/vue-resource/blob/develop/docs/http.md

Vue.http.get('/someUrl', [config]).then(successCallback, errorCallback);
Vue.http.post('/someUrl', [body], [config]).then(successCallback, errorCallback);

errorCallback (callback failed) parameters can be saved

get

 getInfo() { 
// 发起get请求
//  当发起get请求之后, 通过 .then 来设置成功的回调函数
//如果需要传递数据,可以使用 this.$http.get('get.php',{params : jsonData}) 格式, 第二个参数 jsonData 就是传到后端的数据。
    this.$http.get('http://localhost/anli/select.php',{params:{a:1,b:2}}).then(function 		(result) {
       // 通过 result.body 拿到服务器返回的成功的数据
       console.log(result)
       console.log(result.body)
    })
 },

post

 postInfo() { 
 // 发起 post 请求   application/x-wwww-form-urlencoded
 //  手动发起的 Post 请求,默认没有表单格式,所以,有的服务器处理不了
 //  通过 post 方法的第三个参数, { emulateJSON: true } 设置 提交的内容类型 为 普通表单数据格式
    this.$http.post('/anli/demo_test_post.php', {name: "菜鸟教程",
    url: "http://www.runoob.com"}, {emulateJSON: true}).then(result => {
         console.log(result.body)
         }, res => {
             console.log(res.status)
         })
},

jsonp

jsonpInfo() { // 发起JSONP 请求
    this.$http.jsonp('http://vue.studyit.io/api/jsonp').then(result => {
        console.log(result.body)
        }, res => {
          	 console.log(res.status)
        })
}

The principle of JSONP

  • Due to security restrictions browser, AJAX does not allow access to different protocols, different domain name and port number of different data interface, the browser that this visit unsafe;

  • Can be dynamically created script tag form, the src attribute of the script tag, data at the address of the interface, because there is no limit cross-domain script tag, this manner of data acquisition, called JSONP (Note: The implementation principle of JSONP, its , JSONP support only Get request);

  • The specific implementation process:

  • Define a client callback method, predefined operations on the data;

  • Then the name of the callback method by URL parameter passing form, submit the data interface to the server;

  • Organize server data interface to send data to the client, the client then took the passed callback method name, a string of splicing a call to this method, sent to the client to parse executed;

  • After the string returned by the server to get the client, as the Script script to parse executed, so it can get a JSONP data;

  • With that through Node.js, done manually request a JSONP example;

    Service-Terminal:

    const http = require('http');
    // 导入解析 URL 地址的核心模块
    const urlModule = require('url');
    
    const server = http.createServer();
    // 监听 服务器的 request 请求事件,处理每个请求
    server.on('request', (req, res) => {
        const url = req.url;
    
        // 解析客户端请求的URL地址
        var info = urlModule.parse(url, true);
    
        // 如果请求的 URL 地址是 /getjsonp ,则表示要获取JSONP类型的数据
        if (info.pathname === '/getscript') {
            // 获取客户端指定的回调函数的名称
            var cbName = info.query.callback;
            console.log(cbName)
            // 手动拼接要返回给客户端的数据对象
            var data = {
                name: 'zs',
                age: 22,
                gender: '男',
                hobby: ['吃饭', '睡觉', '运动']
            }
            // 拼接出一个方法的调用,在调用这个方法的时候,把要发送给客户端的数据,序列化为字符串,作为参数传递给这个调用的方法:
            var result = `${cbName}(${JSON.stringify(data)})`;
            // 将拼接好的方法的调用,返回给客户端去解析执行
            res.setHeader('Content-Type','text/plain;charset=utf-8')
            res.end(result);
        } else {
            res.end('404');
        }
    });
    
    server.listen(3000, () => {
        console.log('server running at http://127.0.0.1:3000');
    });
    

    Client:

    <script>
    	function show(data) {
            console.log(data);
        }
    </script>
    <script src='http://127.0.0.1:3000/getscript?callback=show'></script>
    

get, post, jsonp all the code:

<!doctype html>
<html>

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./js/vue-2.4.0.js"></script>
    <!-- 注意:vue-resource 依赖于 Vue,所以先后顺序要注意  -->
    <!-- this.$http.jsonp -->
    <script src="./js/vue-resource-1.3.4.js"></script>
</head>

<body>
<div id="app">
    <input type="button" value="get请求" @click="getInfo">
    <input type="button" value="post请求" @click="postInfo">
    <input type="button" value="jsonp请求" @click="jsonpInfo">
</div>

<script>
    // 创建 Vue 实例,得到 ViewModel
    var vm = new Vue({
        el: '#app',
        data: {},
        methods: {
            getInfo() { // 发起get请求
                //  当发起get请求之后, 通过 .then 来设置成功的回调函数
                //如果需要传递数据,可以使用 this.$http.get('get.php',{params : jsonData}) 格式,
                // 第二个参数 jsonData 就是传到后端的数据。
                this.$http.get('http://localhost/anli/select.php', {params: {a: 1, b: 2}}).then(function (result) {
                    // 通过 result.body 拿到服务器返回的成功的数据
                    console.log(result)
                    console.log(result.body)
                })
            },
            postInfo() { // 发起 post 请求   application/x-wwww-form-urlencoded
                //  手动发起的 Post 请求,默认没有表单格式,所以,有的服务器处理不了
                //  通过 post 方法的第三个参数, { emulateJSON: true } 设置 提交的内容类型 为 普通表单数据格式
                this.$http.post('/anli/demo_test_post.php', {
                    name: "菜鸟教程",
                    url: "http://www.runoob.com"
                }, {emulateJSON: true}).then(result => {
                    console.log(result.body)
                }, res => {
                    console.log(res.status)
                })
            },
            jsonpInfo() { // 发起JSONP 请求,案例的这个接口不好使。。。
                this.$http.jsonp('http://vue.studyit.io/api/jsonp').then(result => {
                    console.log(result.body)
                }, res => {
                    console.log(res.status)
                })
            }
        }
    });
</script>
</body>
</html>

Global configuration (recommended script written in script at the top)

https://github.com/pagekit/vue-resource/blob/HEAD/docs/config.md

Global Configuration Interface with domain name

Unplaced before:

this.$http.jsonp('http://vue.studyit.io/api/jsonp')
this.$http.get('http://vue.studyit.io/api/get')

Configuration

Vue.http.options.root = 'http://vue.studyit.io/';
//如果我们通过全局配置了请求的接口的根域名,在每次单独发起http的时候,请求的url路径应该以相对路径开头,前面不能带 / ,否则不会启用根路径做拼接
this.$http.jsonp('api/jsonp')
this.$http.get('api/get')

Global emulateJSON rendering

Vue.http.options.emulateJSON = true;
this.$http.post('/anli/demo_test_post.php', {
                    name: "菜鸟教程",
                    url: "http://www.runoob.com"
                }).then(result => {
                    console.log(result.body)
                }, res => {
                    console.log(res.status)
                       })

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Origin blog.csdn.net/qq_43537987/article/details/93403293