在vue项目中使用自己封装的ajax

在 src 目录下新建 vue.extend.js ,内容如下：

export default
{
    install(Vue)
    {
        Vue.prototype.$http=function(options){
            /*将数据转化为字符串*/
            var strData=function(data){
                var dataStr="";
                for(var key in data){
                    dataStr += key+'='+data[key]+'&';
                }
                dataStr = dataStr && dataStr.slice(0,-1);
                return dataStr;
            };
            /*创建 XMLHttpRequest 对象*/
            var createXHR=function(){
                var xhr;
                if (window.XMLHttpRequest)
                {// code for IE7+, Firefox, Chrome, Opera, Safari
                      xhr=new XMLHttpRequest();
                }
                else
                {// code for IE6, IE5
                      xhr=new ActiveXObject("Microsoft.XMLHTTP");
                }
                return xhr
            };
            /*向服务器发送请求*/
            var open=function(xhr,type,url,async){
                xhr.open(type,url,async);
            };
            var send=function(xhr,msg){
                xhr.send(msg);
            };
            var setHeaders=function(xhr,headers){
                xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
                if(!headers){
                    return false;
                }
                for(var key in headers){
                    xhr.setRequestHeader(key,headers[key]);
                }
            }
            var request=function(xhr,opts){
                if(opts.type==="GET"){
                    open(xhr,opts.type,opts.url+'?'+strData(opts.data),opts.async);
                    send(xhr,null);
                }
                else if(opts.type==="POST"){
                    open(xhr,opts.type,opts.url,opts.async);
                    if(opts.headers){
                        setHeaders(xhr,opts.headers);
                    }
                    send(xhr,strData(opts.data));
                }
            };
            return new Promise((resolve,reject)=>{
                if(!options || typeof options != 'object'){
                    reject(new Error("参数错误，请传入对象参数！"));
                    return false;
                }
                if(!options.url){
                    reject(new Error("url不能为空"));
                    return false;
                }
                options.type = options.type?options.type.toUpperCase():'GET';
                options.async = (options.async && options.async === false)?false:true;
                options.dataType = options.dataType || "json";
                options.data = options.data || {};
                options.headers = options.headers || {};
                var dataStr=strData(options.data);
                /*创建 XMLHttpRequest 对象*/
                var xhr=createXHR();
                /*创建服务器返回响应后执行操作函数*/
                xhr.onreadystatechange=function(){
                    var responseData;
                    if(xhr.readyState == 4){
                        switch  (xhr.status){
                            case 200:
                                switch (options.dataType){
                                    case "xml":
                                        responseData=xhr.responseXML;
                                        break;
                                    case "text":
                                        responseData = xhr.responseText;
                                        break;
                                    case "json":
                                        responseData = JSON.parse(xhr.responseText);
                                        break;
                                }
                                resolve(responseData);
                            default:
                                reject(new Error("这里做错误处理"));
                        }
                    }
                };
                /*向服务器发送请求*/
                request(xhr,options);
            })
        };
        Vue.prototype.$post=function(options){
            options.type='post';
            return this.$http(options);
        };
        Vue.prototype.$get=function(options){
            options.type='get';
            return this.$http(options);
        };
    }
}

在 main.js 中引入vue.extend.js

import utils from './vue.extend'

Vue.use(utils);

然后就可以通过this.$http、this.$get、this.$post使用啦

      this.$http({
          url:"https://api.api68.com/klsf/getLotteryInfo.do?issue=&lotCode=10009",
          type:"get"
      })
      .then(function(res){
          console.log("$http",res);
          console.log(this.msg);
      }.bind(this))
      .catch(function(err){
          console.log(err)
      }.bind(this))

      this.$get({
          url:"https://api.api68.com/klsf/getLotteryInfo.do?issue=&lotCode=10009"
      })
      .then(function(res){
          console.log("$get",res);
          console.log(this.msg);
      }.bind(this))
      .catch(function(err){
          console.log(err)
      }.bind(this))

this.$post({
          url:"https://api.api68.com/klsf/getLotteryInfo.do",
          data:{
              issue:"",
              lotCode:"10009"
          }
      })
      .then(function(res){
          console.log("$post",res);
          console.log(this.msg);
      }.bind(this))
      .catch(function(err){
          console.log(err)
      }.bind(this))