Extjs 4中怎么设置window为半透明？

This topic created in 4946 days ago, the information mentioned may be changed or developed.

查了文档，似乎是设置plain为true即可，但是不管用啊。代码如下：

Ext.create('Ext.window.Window', {
title: 'Floating Window',
id:'floating_id',
height: 200,
width: 400,
layout: 'fit',
plain: true,
}).show();

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window true plain