​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 数组</h1>
​
<p>将前两个数组元素复制到第三和第四个位置：</p>
​
<p id="demo"></p>
​
<script>
const fruits = ["Banana", "Orange", "Apple", "Mango", "Kiwi", "Papaya"];
document.getElementById("demo").innerHTML = fruits.copyWithin(2,0,2);
</script>
​
<p>Internet Explorer 不支持 copyWithin() 方法。</p>
​
</body>
</html>
​