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<!DOCTYPE html> <html> <body> <ul id="myList"><li>咖啡</li><li>茶</li><li>牛奶</li></ul> <p>单击该按钮可删除 ul 的所有子节点。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var list = document.getElementById("myList"); while (list.hasChildNodes()) { list.removeChild(list.firstChild); } } </script> </body> </html>