第一个按钮能够使text框里不断输出星号大概代码:Dim ST As Long, ED As Longfor i=1 to 500t=t+"*"text1.text=tST = Timer Do ED = Timer DoEvents Loop Until ED - ST >= 1 '每个循环进行1秒next i想按另一个按钮立即终止text框里的输出,如何加代码?