微信升级到6.6.0后，模态框里的文字变成了白底，并且文字变成了可编辑的。platform详情如下：

"system":"iOS 10.3.3","version":"6.6.0","fontSizeSetting":16,"model":"iPhone 6s<iPhone8,1>","pixelRatio":2,"windowHeight":555,"screenWidth":375,"screenHeight":667,"windowWidth":375,"language":"zh_CN","brand":"iPhone","platform":"ios","SDKVersion":"1.7.0"