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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