Go Json Marshal字段不输出

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type Test struct {
	Total int    `json:"total"`
	item  string `json:"item"`
}

func main() {
	resp := Test{
		Total: 1,
		item:  "aa",
	}
	body, err := json.Marshal(resp)
	fmt.Printf("body=%v, err=%v \n", string(body), err) // 输出 body={"total":1}, err=<nil>
}