html运行实例（eg_js_object_property

代码示例：（标识：eg_js_object_property_add）

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 对象属性</h1>

<p>您可以向现有对象添加新属性。</p>

<p id="demo"></p>

<script>
var person = {
  firstname:"Bill",
  lastname:"Gates",
  age:62,
  eyecolor:"blue"
};

person.nationality = "English";
document.getElementById("demo").innerHTML =
person.firstname + " is " + person.nationality + ".";
</script>

</body>
</html>