fetch('https://xxx.com/?appid=123456&username='+username+'&password='+password+'&date='+new Date().getTime())
    .then(data => {
        if (data.ok) {
            return data.json()
        }else{
            return Promise.reject('请求失败')  
        }
     })
    .then(data => {
         console.log(data.isstatus)
         if(data.isstatus==true){
            localStorage.setItem("username", data.username, 24 * 60 * 60,);
            localStorage.setItem("openid", data.openid, 24 * 60 * 60,);
            MIP.viewer.open('shop.html', {replace: true})
         }else{
            document.getElementById("tishi").innerHTML="登陆失败:用户名或密码错!";
         }
    })
    .catch(error => console.log('请求失败:', error));
    }

使用用axios请求,

axios
 .get('https://xxxx.com/?appid=123456&md5=31D1D597E5E26E6B4CACC74FF54E0193&openid='+localStorage.openid)
 .then(response => (this.list = response.data))

看起来axios比较简单3行代码而已,但是这个需要先引入

	<script src="https://cdn.bootcss.com/axios/0.18.0/axios.js"></script>

axios的js文件

试用fetch以post方式提交

        fetch('xxx.com', { 
            method: 'post', 
            headers: { 
              "Content-type": "application/x-www-form-urlencoded; charset=UTF-8" 
            }, 
            body: 'username=bar&password=ipsum' 
          })
            .then(data => {
            if (data.ok) {
                return data.json()
            }else{
                return Promise.reject('请求失败')  
            }
        })
          .then(data => { 
            console.log('Request succeeded with JSON response', data); 
          }) 
          .catch(error => { 
            console.log('Request failed', error); 
          });