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"}  }}