When a UI component gains or loses the keyboard focus, it generates events that can be captured through the onfocus and onblur attributes.
当UI组件获得或丢失键盘焦点，它将生成可以通过onfocus和onblur属性捕获的事件。
When a UI component gains or loses the keyboard focus, it generates events that can be captured through the onfocus and onblur attributes.
当UI组件获得或丢失键盘焦点，它将生成可以通过onfocus和onblur属性捕获的事件。
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