用什么方法能使input输入框变为灰色不能选择样式?

1<input checked="" name="radiobutton" type="radio" value="radiobutton"/>

在这段代码里加入什么能使输入框变为灰色不能选择样式
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1<input checked="" disabled="" name="radiobutton" type="radio" value="radiobutton"/>
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