diff --git a/js-basic-practice/index.js b/js-basic-practice/index.js
new file mode 100644
index 0000000..1170da5
--- /dev/null
+++ b/js-basic-practice/index.js
@@ -0,0 +1,39 @@
+// 陳景斌
+
+function getBMI(height, weight) {
+    var bmi =  weight / (height*height);
+    return bmi;
+}
+
+function getMessage(height, weight) {
+    var bmi =  getBMI(height, weight);
+    if ( bmi < 18) {
+        return '過輕：BMI＜18'
+    }
+    
+    if (bmi >= 18 || bmi < 24) {
+        return '正常：18.5≦BMI＜24'
+    }
+    
+    if (bmi >= 24 || bmi < 27) {
+        return '過重：24≦BMI＜27'
+    }
+
+    if (bmi >= 27 || bmi < 30) {
+        return '輕度肥胖：27≦BMI＜30'
+    }
+    
+    if (bmi >= 30 || bmi < 35) {
+        return '中度肥胖：30≦BMI＜35'
+    }
+    
+    if (bmi >= 35 ) {
+        return '重度肥胖：BMI≧35'
+    }
+}
+
+getMessage(1.7,60);
+
+
+
+