update for sign

@@ -38,7 +38,7 @@ const packageSort = argument => {
  * @return {string}          生成的签名字符串
  */
 const makeSign = argument => {
-    var qs = [];
+    let qs = [];
 
     _.forEach(argument, function(value, key) {
         qs.push(key + '=' + _.trim(value));
@@ -49,10 +49,12 @@ const makeSign = argument => {
 
 // 生成API签名，调用后端接口的时候有私钥校验
 exports.apiSign = (params) => {
+    const clientType = params.client_type || 'web';
+
     /* eslint-disable */
-    var sign = packageSort(Object.assign({
-        client_type: 'h5',
-        private_key: privateKey.h5,
+    let sign = packageSort(Object.assign({
+        client_type: clientType,
+        private_key: privateKey[clientType],
         app_version: '3.8.2',
         os_version: 'yohobuy:h5',
         screen_size: '720x1280',