指针结构体

http://www.javashuo.com/article/p-zhzvgydt-p.html

• type Member struct {
  	id          int
  	name, email string
  	gender, age int
  }
  
  func TestChange(t *testing.T) {
  	m1 := Member{}
  	m2 := new(Member)
  	Change(m1, m2)      //值传递，这里须要传指针才有效
  	fmt.Println(m1, m2) //{0   0 0} &{0 小红  0 0}
  }
  
  func Change(m1 Member, m2 *Member) {
  	m1.name = "小明"
  	m2.name = "小红"
  }
  
  func TestMember(t *testing.T) {
  	var m1 Member //全部字段均为空值
  	var m2 = &Member{}
  	var m3 = new(Member)
  	var m4 = &m1
  	m1.age = 12
  	m2.age = 13
  	m3.age = 14
  	m4.age = 145
  	t.Logf("%T %v", m1, m1.age)
  	t.Logf("%T %v", m2, m2.age)
  	t.Logf("%T %v", m3, m3.age)
  	t.Logf("%T %v", m4, m4.age)
  
  }