如果運行代碼1： 代碼如下: var ul = document.getElementById('demo'); var liList = ul.getElementsByTagName('li'); for (var i = 0; i < = liList.length; i++) { ul.removeChild(liList[i]); }
如果和我一樣被欺騙了，那么看看正確的代碼就明白原因啦！ 代碼如下: var ul = document.getElementById('demo'); var liList = ul.getElementsByTagName('li'); var lilength = liList.length; for (var i = 0; i < lilength; i++) { ul.removeChild(liList[0]); }
