<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>建站学-www.jzxue.com</title> <script type="text/javascript"> function addList(){ var list = document.getElementById("list"); for(var i = 1; i <= 5; i++){ var newOption = document.createElement("option"); newOption.setAttribute("value", i); newOption.appendChild(document.createTextNode("建站学" + i)); list.appendChild(newOption); } } function clearList(){ var list = document.getElementById("list"); for(var i = list.options.length; i >= 0; i--){ list.remove(i); } //注意：每删除一个option其它option的index特性会自动重置，因此，按以下方法(即从上往下删是清除不了的) //for(var i = 0; i< list.options.length; i++){ // list.remove(i); //} } </script> </head> <body> <select name="list" id="list"> </select> <input type="button" onclick="addList()" value="生成"/> <input type="button" onblur="clearList()" value="清空" /> </body> </html>
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