Fix isNaN call

Author: sgdan

README.md

@@ -65,3 +65,11 @@ An executable JAR which can be run as a desktop app
  ./gradlew clean shadowJar
  java -jar build/libs/javascript-app-wrapper-all.jar
 ```
+To test dev mode unpack first...
+```
+java -jar build/libs/javascript-app-wrapper-all.jar unpackage
+```
+...then rebuild and run
+```
+./gradlew shadowJar && java -jar build/libs/javascript-app-wrapper-all.jar
+```

src/main/resources/web/worker.js

@@ -2,7 +2,7 @@ var Thread = java.lang.Thread
 
 function doWork(seconds) {
     var s = parseInt(seconds)
-    if (s.isNaN() || s < 0 || s > 15) {
+    if (isNaN(s) || s < 0 || s > 15) {
         ui.send("workDone", "Invalid work time", s, Thread.currentThread().name)
     } else {
         console.log("working for " + seconds + " seconds")