for循环删除的时候要用临时变量保存e.Next()，删除后再赋值给e，否则删除后e=nil就直接退出了

func TestList(t *testing.T) {
	l := list.New()
	for i := 0; i < 10; i++ {
		l.PushBack(i)
	}
	//fmt.Printf("%v",l.)
	for e := l.Front(); e != nil; e = e.Next() {
		fmt.Print(e.Value.(int))
	}
	fmt.Println("")
	var next *list.Element
	for e := l.Front(); e != nil; {
		if e.Value.(int) == 5 || e.Value.(int) == 7 {
			next = e.Next()
			l.Remove(e)
			e = next

		} else {
			e = e.Next()
		}
	}

	for e := l.Front(); e != nil; e = e.Next() {
		fmt.Print(e.Value.(int))
	}
	t.Errorf("%v",l)
}