当常量可以从json文件中读取时，可直接将json文件的内容作为go里的常量，然后解析出想要的结果。
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package main
import (
"encoding/json"
"log"
"fmt"
)
type province struct {
Value string `json:"value"`
Label string `json:"label"`
Children []city `json:"children"`
}
type city struct {
Value string `json:"value"`
Label string `json:"label"`
}
var ProvinceList []province
const provinceStr = `
[
{
"value": "北京",
"label": "北京",
"children": [
{
"value": "北京",
"label": "北京"
}
]
},
{
"value": "天津",
"label": "天津",
"children": [
{
"value": "天津",
"label": "天津"
}
]
}
]
`
func main() {
if err := json.Unmarshal([]byte(provinceStr), &ProvinceList); err != nil {
log.Fatalf("failed to to unmarshal province err: %v", err)
}
fmt.Println(ProvinceList)
}
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