修改加载图标的默认颜色 

在已经添加下拉刷新页面对应的json文件中添加

  "enablePullDownRefresh": true,   "backgroundTextStyle": "dark"   //下拉刷新函数 onPullDownRefresh:function(){     //....     wx.stopPullDownRefresh({       success: (res) => {         console.log('停止下拉刷新')       },     })   }   参考 https://blog.csdn.net/jian_xi/article/details/76473783