说明: 计算器制作Button btn = (Button)sender; if (f == 1) { str1 = str1 + btn.Text.Trim (); Label1.Text = str1; } else { str2 = str2 + btn.Text .Trim ();; Label1.Text = str1 + opr + str2; } } protected void Button_opr_Click(object sender, EventArgs e) { Button
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