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我有一个带有脚本管理器和更新面板的 asp.net 页面,以避免页面的回发事件(试图在此运行客户端)。我想在按钮单击事件中添加一个从 0 到 100 的计数器,并在完成时设置文本框的 txt 属性?这个怎么做??