优化获取openid

@@ -101,7 +101,11 @@ Page({
      */
     onShow: function () {
         let self = this;
+        wx.showLoading({title:'加载中',mask:true});
         self.login();
+        setTimeout(function () {
+            wx.hideLoading()
+        }, 1000);
     },
 
     /**