html运行实例（js_object_display_properties

代码示例：（标识：js_object_display_properties_loop）

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 对象</h1>

<p>显示对象属性：</p>

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

<script>
const person = {
  name: "Bill",
  age: 19,
  city: "Seattle"
};

let txt = "";
for (let x in person) {
  txt += person[x] + " ";
};

document.getElementById("demo").innerHTML = txt;
</script>

</body>
</html>