简单的基于promise的ajax封装

Posted 2022-01-08 lanxiansen

 

基于promise的ajax封装

  1 //调用方式:
  2 /*
  3   ajaxPrmomise(
  4   url:,
  5   method:,
  6   headers:
  7 ).then(res=>)
  8 */
  9 
 10 ;(function(window)
 11   //设置默认的参数配置项
 12   let _default = 
 13     url:‘‘,
 14     baseURL:‘‘,
 15     method:‘GET‘,
 16     params:null, //get请求基于问号传参方式传递给服务器的内容
 17     headers:,
 18     timeout:500,
 19     dataType:‘json‘, 
 20     data:null,  //post请求基于请求主体传参方式传递给服务器的内容
 21     cache:true   //是否缓存数据
 22   ;
 23   //resolve,reject,response,fn
 24   let _setResponseMsg = function _setResponseMsg(...rest)
 25       let [
 26         resolve,
 27         reject,
 28         xhr,
 29         fn
 30       ] = rest,
 31       res = null,
 32       response = xhr;
 33       res.data = fn(response.responseText);
 34       res.status = response.status;
 35       res.statusText = response.statusText;
 36       res.xhr = response;
 37       res.headers = response.getAllResponseHeaders();
 38       resolve(res)
 39   
 40 
 41   let _convertJSON = function _convertJSON(result)
 42       let data = "";
 43       try 
 44         data = JSON.parse(result);
 45        catch (e) 
 46         reject(e)
 47       
 48       return data
 49   
 50 
 51   let _convertString = function _convertString(result)
 52       return result;
 53   
 54 
 55   let _array_to_str = function _array_to_str(key,arr)
 56       let params = "";
 57       for(let i0;i<arr.length;i++)
 58         params += `$key=$arr[i]&`;
 59       
 60       return params.slice(0,-1)
 61   
 62 
 63   let _convertParams = function _convertParams(cache,params)
 64     let str = "?",
 65         time_str = cache ? "":(+(new Date())+"");
 66       if(typeof params == ‘object‘ && Object.keys(params).length > 0)
 67           for(let key in params)
 68             if(typeof params[key] == ‘object‘ && (length in params[key]))
 69               str += _array_to_str(key,params[key])
 70             
 71             str += `$key=$params[key]`;
 72           
 73       
 74       return str+"&time="+time_str;
 75   
 76 
 77   let _setHeader = function _setHeader(...res)
 78     let [xhr,headers] = res;
 79     for(let key in headers)
 80       xhr.setRequestHeader(key,headers[key])
 81     
 82   
 83 
 84   //基于promise管理ajax请求
 85   let ajaxPrmomise = function ajaxPrmomise(options=)
 86       // 这里传递的options包含默认配置信息和用户基于暴露的_default修改后的信息
 87       for(let key in _default)
 88         if(key in options)
 89             options[key] = _default[key]
 90         
 91       
 92       let 
 93         url,
 94         method,
 95         baseURL,
 96         data,
 97         dataType,
 98         headers,
 99         cache,
100         params
101        = options;
102       let xhr,send_data;
103 
104       return new Promise((resolve,reject)=>
105           xhr = new XMLHttpRequest();
106           _setHeader(xhr,headers);
107           send_data = method.toLowerCase() == ‘get‘ ? _convertParams(cache,params):(method.toLowerCase() == ‘post‘? data:"");
108           all_url = baseURL + url + send_data;
109           xhr.open(method,all_url);
110           xhr.onreadystatechange = function()
111             if(xhr.readyState == 4)
112               if(/^[23]\\d2$/.test(xhr.status))
113                   dataType = dataType.toUpperCase();
114                   if(dataType == "json")
115                     _setResponseMsg(resolve,reject,xhr,_convertJSON)
116                   _setResponseMsg(resolve,reject,xhr,_convertString)
117                 
118               
119             
120             ajaxPrmomise.xhr = xhr;
121             xhr.send(send_data);
122           )
123       
124   //修改默认配置，可以通过自己设置一些配置来覆盖默认配置
125   ajaxPrmomise.defaults = _default;
126 
127   ajaxPrmomise.get = function(url,options)
128       return ajaxPrmomise(
129         url:url,
130         method:‘get‘
131       )
132   ;
133 
134   ajaxPrmomise.post = function(url,data,options)
135     return ajaxPrmomise(
136       url:url,
137       data:data,
138       method:‘post‘
139     )
140   
141   window.ajaxPrmomise = ajaxPrmomise;
142 (window))

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