您需要设置 fieldStyle 而不是 style 。您还需要覆盖Ext JS默认设置，该默认设置在该字段上设置一个背景图像。像这样：

You need to set fieldStyle instead of style. You also need to override the Ext JS default, which sets a background image on the field. Like this:

fieldStyle: 'background-color: #ddd; background-image: none;'