diff --git a/2017-chu-battle0450/demo.js b/2017-chu-battle0450/demo.js
new file mode 100644
index 0000000..60dcc02
--- /dev/null
+++ b/2017-chu-battle0450/demo.js
@@ -0,0 +1,21 @@
+//黃佳晨
+var getBMI = function(weight, height){
+   return weight/((height/100)*(height/100));
+
+}  
+getBMI(65,171);
+var BMI = getBMI(65,171);
+console.log('BMI: '+BMI);
+
+var getMessage = function(weight,height)
+{ 
+  getBMI(weight,height);
+  if(BMI<18.5) 
+   console.log('體重過輕');
+  else if(BMI<24&&BMI>=18.5)
+   console.log('正常範圍');
+  else if(BMI>=24&&BMI<30)
+   console.log('過重');
+}
+
+getMessage(65,171);
\ No newline at end of file
diff --git a/2017-chu-battle0450/package.json b/2017-chu-battle0450/package.json
new file mode 100644
index 0000000..25d5b5e
--- /dev/null
+++ b/2017-chu-battle0450/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "ex03",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node demo.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}