diff --git a/bmi.js b/bmi.js
new file mode 100644
index 0000000..43c44ab
--- /dev/null
+++ b/bmi.js
@@ -0,0 +1,44 @@
+
+function getbmi(height,weight){
+height = height / 100;
+ var bmi = weight / (height * height);
+ return bmi;
+}
+
+
+function getMessage (bmi) {
+
+    if(bmi <18.5){
+     
+console.log("體重過輕");
+
+}else if(bmi >= 18.5 && bmi <24){
+      
+console.log("正常範圍");
+
+}else if(bmi >=24 && bmi < 27){
+     
+console.log("過重");
+ 
+}else if(bmi >=27 && bmi < 30){
+      
+console.log("輕度肥胖");
+
+}else if(bmi >=30 && bmi < 35){
+      
+console.log("中度肥胖");
+
+}else{
+   
+console.log("重度肥胖");
+
+}
+
+ 
+}
+
+    
+
+console.log(getbmi(175,60));
+var bmiresult =(getbmi(175,60));
+getMessage(bmiresult);