题目内容:
本题的功能是用按钮来控制文本框中文本的颜色。窗口中有两个带有文字标题的而板“Sample text”和“Text col-or control”。窗口的底部还有一个复选按钮“Disable changes”。在“Sample text”面板中有一个带有字符串的文本框,而在“Text color control”面板中有三个按钮:“Black”、“Red”和“Green”,并且每个按钮上都有一个对应颜色的圆。单击任意按钮,文本框中的文本变成对应的颜色,如果选中“Dis—able changes”复选项,则三个颜色按钮变为不可用,如果取消选中复选项,则三个按钮变为可用。![](https://www.kaobei173.com/imgcache/attached/image/20140315/20140315173415_3910.jpg)
![](https://www.kaobei173.com/imgcache/attached/image/20140315/20140315173427_2045.jpg)
![](https://www.kaobei173.com/imgcache/attached/image/20140315/20140315173439_1898.jpg)
![](https://www.kaobei173.com/imgcache/attached/image/20140315/20140315173457_2695.jpg)
![](https://www.kaobei173.com/imgcache/attached/image/20140315/20140315173512_0837.jpg)
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答案解析: