fix: continue decode function callback one-to-one

src/jensen.js

@@ -320,13 +320,13 @@ function Jensen(log) {
         }, self.timewait);
         if (self.onreceive)
             try {
-                self.onreceive(totalBytes, ciDecode(result.data));
+                self.onreceive(totalBytes, continueDecode(result.data));
             } catch (e) {
             }
     };
 
     // 持续解码
-    const ciDecode = (block) => {
+    const continueDecode = (block) => {
         const buff = new ArrayBuffer(RECV_BUFF_SIZE * 2);
         let bview = new Uint8Array(buff);
         for (let k = 0; k < block.byteLength; k++) {
@@ -338,7 +338,8 @@ function Jensen(log) {
         } catch (err) {
             console.error('ci decode', err);
         }
-        return result ? result.message.body : null;
+        const msg = result.message;
+        return result && msg.id === TRANSFER_FILE ? msg.body : null;
     }
 
     const tryDecode = function () {
@@ -784,7 +785,7 @@ Jensen.prototype.getFile = async function (filename, length, ondata, onprogress)
         }
     };
     this.onreceive = onprogress;
-    Jensen.registerHandler(TRANSFER_FILE, handler);
+    Jensen.registerHandler(TRANSFER_FILE, handler); 
     this.send(new Command(TRANSFER_FILE).body(fname));
 };