js请求

 //构造表单数据
        // var formData = new FormData();
        //     formData.append('appid', 'com.taoqi001.wawaji');
        //     formData.append('appver', 116);
        //     formData.append('devid', "7A79962F-F54F-4A07-B542-591E379563B6");
        //     formData.append('devtype', 1);
        //     formData.append('token', "2e0c372832434894752b01587395c7ac");

        //     console.log(formData.get("appid"))
  
            //创建xhr对象 
       var xhr = new XMLHttpRequest();
          //设置xhr请求的超时时间
       xhr.timeout = 3000;
           //设置响应返回的数据格式
       xhr.responseType ="application/json";

      //  xhr.setRequestHeader('content-type', 'application/json');

      var sendData = {'appid':'com.taoqi001.wawaji','appver':116,'devid':"7A79962F-F54F-4A07-B542-591E379563B6",'devtype': 1,'token': "2e0c372832434894752b01587395c7ac","refresh":1};

  
      //创建一个 post 请求，采用异步
       xhr.open('POST', 'https://pre.taoqi001.com/orders/showlist', true);

       //注册相关事件回调处理函数//也可以xhr.onload=function(e)
       xhr.onreadystatechange = function(e) { 
         
        if(xhr.readyState == 4 && xhr.status == 200){{

                 console.log("请求结果",this.responseText)
                alert(this.responseText);

         }
  };
  // xhr.ontimeout = function(e) { ... };
  // xhr.onerror = function(e) { ... };
  // xhr.upload.onprogress = function(e) { ... };
  
  //发送数据
  xhr.send(JSON.stringify(sendData));