空接口和类型断言

bilibili/aceid/struct/kong/test.go

@@ -0,0 +1,28 @@
+package main
+
+import "fmt"
+
+func myFunc(arg interface{}) {
+	fmt.Println("myFunc is called...")
+	fmt.Println(arg)
+	// interface{}的类型断言
+	value, ok := arg.(string)
+	if !ok {
+		fmt.Println("arg is not string")
+	} else {
+		fmt.Println("arg is type, value = ", value)
+		fmt.Printf("valut type is %T\n", value)
+	}
+}
+
+type Book struct {
+	auth string
+}
+
+func main() {
+	book := Book{"Golang"}
+	myFunc(book)
+	myFunc(100)
+	myFunc("abc")
+	myFunc(3.14)
+}