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<button type="button" class="close" data-dismiss="modal" aria-hidden...data-target='#myModal' div.modal fade id='myModal' tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden...="true" 使用模态窗口，您需要有某种触发器...属性 aria-hidden="true" 用于保持模态窗口不可见，直到触发器被触发为止（比如点击在相关的按钮上）。
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隐藏无意义元素如果是无用元素（如不影响业务流程的logo、图片），在最内层的Dom结点设置aria-hidden="true"，或在一组无用元素的容器结点设置aria-hidden="true"。...缺点 【推荐】父结点设置aria-label，值为所有子结点内容拼接的字符串，子结点设置aria-hidden...若子结点需要动态改变，父结点的aria-label也需要随之改变） 【推荐】父结点设置aria-labelledby，值为所有子结点的id（用空格拼接），子结点设置aria-hidden...具体方案：给弹窗下所有元素增加class="under_dialog"（只需要给最外层的容器结点加一次这个类名即可），打开弹窗时，调用$('.under_dialog').attr('aria-hidden...', 'true')，关闭弹窗时调用$('.under_dialog').attr('aria-hidden', 'false')。
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