代码示例：（标识：eg_js_object_accessors_set_3）
<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Getter 和 Setter</h1>
<p>创建完美的计数器对象：</p>
<p id="demo"></p>
<script>
var obj = {
?? counter : 0,
?? get reset() {
?????? this.counter = 0;
?? },
?? get increment() {
?????? this.counter++;
?? },
?? get decrement() {
?????? this.counter--;
?? },
?? set add(value) {
?????? this.counter += value;
?? },
?? set subtract(value) {
?????? this.counter -= value;
?? }
};
// 操作计数器：
obj.reset;
obj.add = 5;
obj.subtract = 1;
obj.increment;
obj.decrement;
// 显示计数器：
document.getElementById("demo").innerHTML = obj.counter;
</script>
</body>
</html>
