使用浮动$ c时，需要注意以下事项$ c> config：

1）固定宽度 - 您已经完成
2）必须在渲染后明确设置该位置 >（例如 myPanel.setPosition（100,100）; ）。

1) Fixed width - which you've done 2) The position must be set explicitly after render (e.g., myPanel.setPosition(100,100);).

您还可以设置底层的Ext.Layer配置选项，而不是设置 floating：true 。您可以按照以下方式执行此操作：

You can also set the underlying Ext.Layer config option instead of just setting floating : true. You can do that in the following way:

Ext.Panel({

  //.. other config..,
  floating : {
    //Ext.Layer config options. Maybe a property in that will get you the desired effect that you're looking for.
  }
});

尝试此更新！

干杯。