<!DOCTYPE html>
<html lang="en-US">
<body>
<p id="point"></p>
<script>
var x = document.getElementById("point");
var bike = {brand: "Honda", color: "red"};
if ("model" in bike === false)
bike.model = "cb1000r";
x.innerHTML = "Model : "+bike.model;
</script> </body>
</html>