no message

workers/process.js

@@ -1,13 +1,9 @@
 // worker的优化计算
+const math = require('../utils/math')
+
 worker.onMessage(function(res){
   console.log('这是worker内部线程打印的')
   console.log(res)
-  let sum = add(res.x,res.y);
-  worker.postMessage({
-    sum : sum
-  })
-});
-
-function add(x, y){
-  return x + y;
-}
+  let sum = math.plus(res.x, res.y)
+  worker.postMessage({ sum : sum })
+})