feat:增加设置杠杆

@@ -250,4 +250,10 @@ class CmBroker
         }
         return $levers;
     }
+    //设置杠杆
+    public function setLever($symbol, $lever)
+    {
+        $symbol = $this->getSymbolOri($symbol, $this->plat);
+        $this->exBroker->setLever($symbol, $lever);
+    }
 }

@@ -286,4 +286,25 @@ class ExBroker
         }
         return $levers;
     }
+    //设置杠杆
+    public function setLever($instId, $lever)
+    {
+        $param = [
+            'instId' => $instId,
+            'lever' => $lever,
+            'mgnMode' => 'cross',
+        ];
+        $res = $this->api->setLeverage($param);
+        if ($res && $res['code'] == 0) {
+            output($instId, '设置杠杆为：', $lever);
+            return true;
+        } else {
+            $msg = $res['msg'];
+            if ($res["data"] && $res["data"]["msg"]) {
+                $msg = $res["data"]["msg"];
+            }
+            output($instId, '设置杠杆错误', $msg);
+            return false;
+        }
+    }
 }