fix

@@ -4,6 +4,7 @@ import (
 	"crypto/sha1"
 	"encoding/hex"
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
 	"math/rand"
 	"net/http"
@@ -13,6 +14,19 @@ import (
 	"time"
 )
 
+
+var DefaultImClient ImClient
+
+var ErrorFailCall = fmt.Errorf(" imclient call failed")
+
+func InitImClient(baseUrl ,appKey,appSecret string){
+	DefaultImClient = ImClient{
+		baseUrl:baseUrl,
+		appKey:appKey,
+		appSecret:appSecret,
+	}
+}
+
 func buildCheckSum(appSecret string, nonce string, curTime string) string {
 	str := []byte(appSecret + nonce + curTime)
 	sh := sha1.New()