代码如下:<%@ Page Language=”C#” %> <!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”> [removed]<!– protected void Page_Load(object sender, EventArgs e) { if(!Page.IsPostBack) { TextBox1.Attributes.Add(“onkeyup”, “LimitT