### URL参数排序
```go
// url query 参数key排序(按key升序)
var u1 = "https://www.baidu.com/?userId=admin&name=john&order=1&auto=2"
u, err := url.Parse(u1)
if err != nil {
fmt.Println("err", err.Error())
return
}
s := u.Query().Encode()
fmt.Printf("query:%s\n", s)
// 自行拼接参数
values := url.Values{}
values.Set("d", "vd")
values.Set("c", "vc")
values.Set("b", "vb")
values.Set("a", "va")
fmt.Printf("values:%s\n", values.Encode())
```
```
query:auto=2&name=john&order=1&userId=admin
values:a=va&b=vb&c=vc&d=vd
```
### URL编码与解码
```go
urlStr := "你好，世界！"
escapeUrl := url.QueryEscape(urlStr)
fmt.Printf("url encode:%s\n", escapeUrl)
enEscapeUrl, _ := url.QueryUnescape(escapeUrl)
fmt.Printf("url decode:%s\n", enEscapeUrl)
```
```
url encode:%E4%BD%A0%E5%A5%BD%EF%BC%8C%E4%B8%96%E7%95%8C%EF%BC%81
url decode:你好，世界！
```
