为什么这个例子按预期工作（试试看）：
<!DOCTYPE html>
<html>
<body>
<ul id="myList1"><li>Coffee</li><li>Tea</li></ul>
<ul id="myList2"><li>Water</li><li>Milk</li></ul>
<p>Click the button to copy an item from one list to another.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var itm = document.getElementById("myList2").lastChild;
var cln = itm.cloneNode(true);
document.getElementById("myList1").appendChild(cln);
}
</script>
</body>
</html>
而如果<ul>列表被分成多行，它就不起作用（试试看）：
<!DOCTYPE html>
<html>
<body>
<ul id="myList1"><li>Coffee</li><li>Tea</li></ul>
<ul id="myList2">
<li>Water</li>
<li>Milk</li>
</ul>
<p>Click the button to copy an item from one list to another.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var itm = document.getElementById("myList2").lastChild;
var cln = itm.cloneNode(true);
document.getElementById("myList1").appendChild(cln);
}
</script>
</body>
</html>
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