原来scala函数参数定义=>左边可以不加参数，表示无参，并且可以用大括号代替小括号

object WithScope {
  def withScope2(fun: =>String)={
    fun
  }
  
  def fun()={
    println("haha")
    "success"
  }
  def main(args: Array[String]): Unit = {
    withScope2(fun)
  }
}

object WithScope {
  def withScope2(fun: =>String)={
    fun
  }
  def withScope1(fun: (String)=>String)={
    fun
  }
  def fun()={
    println("haha")
    "success"
  }
  def main(args: Array[String]): Unit = {
    withScope2{fun;println(11);"111"}
  }
}