Vue学习笔记之四Vue的Ajax请求

4. Vue的Ajax请求

4.1 Vue-resource插件介绍

下载地址：

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

$.ajax能做的事情，vue-resource插件一样也能做到，而且vue-resource的API更为简洁。另外，vue-resource还提供了非常有用的inteceptor功能，使用inteceptor可以在请求前和请求后附加一些行为，比如使用inteceptor在ajax请求时显示loading界面。

vue-resource的特点：

1. 体积小

vue-resource非常小巧，在压缩以后只有大约12KB，服务端启用gzip压缩后只有4.5KB大小，这远比jQuery的体积要小得多。

2. 支持主流的浏览器

和Vue.js一样，vue-resource除了不支持IE 9以下的浏览器，其他主流的浏览器都支持。

3. 支持Promise API和URI Templates

Promise是ES6的特性，Promise的中文含义为“先知”，Promise对象用于异步计算。
URI Templates表示URI模板，有些类似于ASP.NET MVC的路由模板。

4. 支持拦截器

拦截器是全局的，拦截器可以在请求发送前和发送请求后做一些处理。
拦截器在一些场景下会非常有用，比如请求发送前在headers中设置access_token，或者在请求失败时，提供共通的处理方式。

4.1.1 Methods

• get(url, [config])
• head(url, [config])
• delete(url, [config])
• jsonp(url, [config])
• post(url, [body], [config])
• put(url, [body], [config])
• patch(url, [body], [config])

4.1.2 Config

Parameter	Type	Description
url	string	URL to which the request is sent
body	Object, FormData, string	Data to be sent as the request body
headers	Object	Headers object to be sent as HTTP request headers
params	Object	Parameters object to be sent as URL parameters
method	string	HTTP method (e.g. GET, POST, ...)
responseType	string	Type of the response body (e.g. text, blob, json, ...)
timeout	number	Request timeout in milliseconds (0 means no timeout)
credentials	boolean	Indicates whether or not cross-site Access-Control requests should be made using credentials
emulateHTTP	boolean	Send PUT, PATCH and DELETE requests with a HTTP POST and set the X-HTTP-Method-Override header
emulateJSON	boolean	Send request body as application/x-www-form-urlencoded content type
before	function(request)	Callback function to modify the request object before it is sent
uploadProgress	function(event)	Callback function to handle the ProgressEvent of uploads
downloadProgress	function(event)	Callback function to handle the ProgressEvent of downloads

4.1.3 Response

A request resolves to a response object with the following properties and methods:

Property	Type	Description
url	string	Response URL origin
body	Object, Blob, string	Response body
headers	Header	Response Headers object
ok	boolean	HTTP status code between 200 and 299
status	number	HTTP status code of the response
statusText	string	HTTP status text of the response
Method	Type	Description
text()	Promise	Resolves the body as string
json()	Promise	Resolves the body as parsed JSON object
blob()	Promise	Resolves the body as Blob object

4.1.4 实例

get请求

    {{ userList }}
    get请求

new Vue({
    el:'#app',
    data:{
        userList:null
    },
    methods:{
        getdata:function(){
            //请求的url
            var url = 'https://www.layui.com/demo/table/user/';
            //利用vue-resource发出Ajax请求
            this.$http.get(url)//发出请求
                .then(function(response){//获取服务器返回的数据
                this.userList = response.body;//获取当前url响应回来的数据
            });
        }
    }
})

post请求

new Vue({
    el:'#app',
    methods:{
        postdata:function(){
            //请求的url
            var url = 'https://www.layui.com/demo/table/user/';
            //利用vue-resource发出Ajax请求
            //post有三个参数:post(url,传入服务器的请求报文体数据,{emulateJson:true})
            this.$http.post(url,{name:'张三'},{emulateJson:true})//发出post请求
                .then(function(response){//获取服务器返回的数据
                console.log(response.body);//获取当前url响应回来的数据
            });
        }
    }
})

jsonp请求

new Vue({
    el:'#app',
    methods:{
        jsonpdata:function(){
            //请求的url
            var url = 'https://www.layui.com/demo/table/user/';
            //利用vue-resource发出Ajax请求
            //url后不需要跟callback参数
            this.$http.jsonp(url)
                .then(function(response){//获取服务器返回的数据
                console.log(response.body);//获取当前url响应回来的数据
            });
        }
    }
})