1、通過switch實現型別斷言

示例：

package main

import "fmt"

type Student struct {
	name string
	id   int
}

func main() {
	i := make([]interface{}, 3)
	i[0] = 1                    //int
	i[1] = "hello go"           //string
	i[2] = Student{"mike", 666} //Student

	//型別查詢，型別斷言
	for index, data := range i {
		switch value := data.(type) {
		case int:
			fmt.Printf("x[%d] 型別為int, 內容為%d\n", index, value)
		case string:
			fmt.Printf("x[%d] 型別為string, 內容為%s\n", index, value)
		case Student:
			fmt.Printf("x[%d] 型別為Student, 內容為name = %s, id = %d\n", index, value.name, value.id)
		}

	}
}

執行結果：

x[0] 型別為int, 內容為1
x[1] 型別為string, 內容為hello go
x[2] 型別為Student, 內容為name = mike, id = 666