/*
* ajax封裝:
* 1. 引入文件
* 2. new Vue().ajax.get(url,data,fn,ojson), 或 new Vue().ajax.post(url,data,fn,ojson)
* url: 需要獲取數(shù)據(jù)的文件地址 (string)
* data: 需要發(fā)送的信息 (可省略) (obj)
* fn: 獲取信息后的回調(diào)函數(shù),接收到的返回值為data (function)
* ojson: 是否需要轉(zhuǎn)換為json格式 (可省略) (設(shè)置為 "json")
*
* 3. new Vue().ajax.get().cancel(): 取消異步請(qǐng)求
* 4. new Vue().ajax.json(str): 可轉(zhuǎn)化json格式字符串
**/
Vue.prototype.ajax={
 //添加url傳送信息
 addUrl: function (url,obj){
  //如果省略u(píng)rl，則為post請(qǐng)求，令obj為url，令url為null
  if(arguments.length==1){
   obj=url;
   url=null;
  }
  //url不為空(get請(qǐng)求: 設(shè)置url信息)
  if(!!url){
   for(var k in obj){
    url += (url.indexOf("?")==-1 ? "?" : "&");
    url+=encodeURIComponent(k)+ "=" +encodeURIComponent(obj[k]);
   }
  }else{
   //post請(qǐng)求(設(shè)置data信息)
   url="";
   for(var k in obj){
    url+=encodeURIComponent(k)+ "=" +encodeURIComponent(obj[k]);
    url+="&";
   }
   //刪除最后一個(gè)&
   var arr=url.split("");
   arr.pop();
   url=arr.join("");
  }
  //返回拼接好的信息
  return url;
 },
 get: function (url,data,fn,ojson){
  this.xhr=new XMLHttpRequest();
  //省略data時(shí),即不發(fā)送數(shù)據(jù)
  if(typeof data =="function"){
   ojson=fn;
   fn=data;
   data={};
  }
  //合并url和data信息
  url=this.addUrl(url,data)
  //是否異步發(fā)送
  this.xhr.open("get",url,true);
  this.xhr.send(null);
  //當(dāng)請(qǐng)求完成之后調(diào)用回調(diào)函數(shù)返回?cái)?shù)據(jù)
  this.success(fn,ojson);
  //鏈?zhǔn)骄幊?  return this;
 },
 post: function (url,data,fn,ojson){
  this.xhr=new XMLHttpRequest();
  //省略data時(shí),即不發(fā)送數(shù)據(jù)
  if(typeof data =="function"){
   ojson=fn;
   fn=data;
   data={};
  }
  //合并data信息
  data=this.addUrl(data);
  //是否異步發(fā)送
  this.xhr.open("post",url,true);
  this.xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  this.xhr.send(data);

  //當(dāng)請(qǐng)求完成之后調(diào)用回調(diào)函數(shù)返回?cái)?shù)據(jù)
  this.success(fn,ojson);
  //鏈?zhǔn)骄幊?  return this;
 },
 //字符串轉(zhuǎn)換json
 json: function (str){
  return (new Function("return " + str))(); 
 },
 success: function (fn,ojson){
  //當(dāng)請(qǐng)求完成之后調(diào)用回調(diào)函數(shù)返回?cái)?shù)據(jù)
  var self=this;
  this.xhr.onreadystatechange=function (){
   var odata;
   if(self.xhr.readyState == 4){
    if((self.xhr.status>=200 && self.xhr.status<300) || self.xhr.status == 304){
     odata=self.xhr.responseText;
     //若為json則轉(zhuǎn)化json格式
     if(ojson==="json"){
      odata=self.json(odata);
     }
     fn(odata);
    }else{
     odata="request was unsuccessful: "+self.xhr.status;
     fn(odata);
    }
   }
  }
 },
 //取消異步請(qǐng)求
 cancel: function (){
  this.xhr.abort();
  return this;
 }
}

 
 


 

  點(diǎn)擊獲取信息
  {{ msg }}
 

 
 
 

[
 {
  "name": "張三",
  "age": 18,
  "sex": "man"
 },
 {
  "name": "李四",
  "age": 20,
  "sex": "woman"
 },
 {
  "name": "王五",
  "age": 22,
  "sex": "man"
 }
]