html运行实例（js_map_get_undefined）-搜寻教程库

代码示例：（标识：js_map_get_undefined）

<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Map 对象</h1>

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

<script>
// 创建对象
const apples = {name: 'Apples'};
const bananas = {name: 'Bananas'};
const oranges = {name: 'Oranges'};

// 创建 Map
const fruits = new Map();

// 向 Map 添加元素
fruits.set(apples, 500);
fruits.set(bananas, 300);
fruits.set(oranges, 200);

document.getElementById("demo").innerHTML = fruits.get("apples");
</script>

</body>
</html>