操作符表示指针指向的底层值 切片 nill 清空 按值引用赋值 获取地址赋值

package main

import "fmt"

var thisVisitedUrls [] string

func tf() {
   p := &thisVisitedUrls
   *p = append(*p, "url")
}
func main() {
   tf()
   fmt.Println(thisVisitedUrls)
   p := &thisVisitedUrls
   *p = append(*p, "url2")
   fmt.Println(thisVisitedUrls)
   *p = nil
   fmt.Println(thisVisitedUrls)
   *p = append(*p, "urlINIT")
   fmt.Println(thisVisitedUrls)
}

package main

import "fmt"

var t = 12
var t1 = t

func main() {
   fmt.Println(t)
   fmt.Println(t1)
   t1 = 123
   fmt.Println(t)
   fmt.Println(t1)
   p1 := &t
   *p1 = 1234
   fmt.Println(t)
   fmt.Println(t1)

   var t2 = &t
   fmt.Println(t)
   fmt.Println(t2)
   *t2 = 12345
   fmt.Println(t)
   fmt.Println(t2)

   var t3 = &t
   fmt.Println(t)
   fmt.Println(t3)
   *t3 = 123456
   var t4 = *t3
   fmt.Println(t)
   fmt.Println(t3)
   fmt.Println(t4)

   *t3 = 1234567
   fmt.Println(t)
   fmt.Println(t3)
   fmt.Println(t4)
}

12
12
12
123
1234
123
1234
0x5211e8
12345
0x5211e8
12345
0x5211e8
123456
0x5211e8
123456
1234567
0x5211e8
123456