var dia=$Dialog(url, title, width, height, noHeader)
var dia=$DialogHtml(html, title, width, height, noHeader)
var dia=$DialogInstall(url, title, width, height, noHeader)
常用方法
dia.Id
dia.AutoSize()
dia.SetSize(width,height)
dia.SetTitle(title)
dia.ShowCover(isShow)//是否显示遮罩
dia.MoveCenter()
dia.Close()
dia.Dispose()
dia.Show()