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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 数组</h1>
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<p>copyWithin() 方法将数组元素复制到数组中的另一个位置，覆盖现有值。</p>
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<p id="demo"></p>
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<script>
const fruits = ["Banana", "Orange", "Apple", "Mango"];
document.getElementById("demo").innerHTML = fruits.copyWithin(2,0);
</script>
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<p>Internet Explorer 不支持 copyWithin() 方法。</p>
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</body>
</html>
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