4、 如何实现既自定义又极其美观的文件选择框？关键在于利用label标签与file输入框进行关联。这样做的优势非常明显：点击精心设计的按钮即等同于触发隐藏的文件控件；避免了尺寸难以控制的问题；完美支持hover和active等交互状态；而且美化后的按钮可自由放置在页面任意位置，只需确保label的for属性值与file控件的id完全对应即可实现无缝联动，从而轻松打造视觉出众且功能完整的上传入口。

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