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A detailed introduction to ajax packaging in react

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Release: 2018-01-15 14:08:21
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本文主要介绍了react中的ajax封装实例详解的相关资料,希望通过本文能帮助到大家,让大家理解掌握这部分内容,需要的朋友可以参考下,希望能帮助到大家。

react中的ajax封装实例详解

代码块


**opts: {'可选参数'}
**method: 请求方式:GET/POST,默认值:'GET';
**url:  发送请求的地址, 默认值: 当前页地址;
**data: string,json;
**async: 是否异步:true/false,默认值:true;
**cache: 是否缓存:true/false,默认值:true;
**contentType: HTTP头信息,默认值:'application/x-www-form-urlencoded';
**success: 请求成功后的回调函数;
**error: 请求失败后的回调函数;
*/
let configResText = function (responseText, resTextType){
 return resTextType == 'html' ? responseText : JSON.parse(responseText);
};

let ajax = function (opts){
 //一.设置默认参数
 var defaults = {  
   method: 'GET',
     url: '',
    data: '',
    async: true,
    cache: false,
 contentType: 'application/x-www-form-urlencoded',
 resTextType: '',
   success: function (){},
    error: function (){}
 };

 //二.用户参数覆盖默认参数  
 for(var key in opts){
  defaults[key] = opts[key];
 }

 //三.对数据进行处理
 if(typeof defaults.data === 'object'){  //处理 data
  var str = '';
  for(var key in defaults.data){
   var curDataStr = JSON.stringify(defaults.data[key]);
   if (curDataStr.charAt(0) == '[' && curDataStr.charAt(curDataStr.length-1) == ']') {
    var arrQuery = JSON.parse(curDataStr).map(function (item){
     return key + '[]=' + item
    }).join('&');
    str += key + '=' + arrQuery + '&';
   } else {
    str += key + '=' + defaults.data[key] + '&';
   }
  }
  defaults.data = str.substring(0, str.length - 1);
 }

 defaults.method = defaults.method.toUpperCase();  //处理 method

 defaults.cache = defaults.cache ? '' : '&' + new Date().getTime() ;//处理 cache

 if( defaults.method === 'GET' && (defaults.data || defaults.cache) ) {
  defaults.url += String('?' + defaults.data + defaults.cache);  //处理 url
  if(defaults.cache){
   defaults.url = defaults.url.replace(/(\?[^\?]+)\?/gi, '$1');
  }
 }

 //四.开始编写ajax
 //1.创建ajax对象
 var oXhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP');
 //2.和服务器建立联系,告诉服务器你要取什么文件
 oXhr.open(defaults.method, defaults.url, defaults.async);
 //3.发送请求
 if(defaults.method === 'GET')
  oXhr.send(null);
 else{
  oXhr.setRequestHeader("Content-type", defaults.contentType);
  oXhr.send(defaults.data);
 }  
 //4.等待服务器回应
 oXhr.onreadystatechange = function (){
  if(oXhr.readyState === 4){
   if(oXhr.status === 200)
    defaults.success.call(oXhr, configResText(oXhr.responseText, defaults.resTextType));
   else{
    defaults.error();
   }
  }
 };
};

export default ajax;
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调用方法


import ajax from '../../commonJS/ajax.js';
ajax({
  url: '',
  data: '',
  success: function(t) {
      if (t) {
      let allpageNum = t.data;
        $this.setState({
         allPages:allpageNum
        });
      }
  }
});
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js中Ajax封装的实例详解

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