<!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=utf-8" /><title>增加页面中下拉列表框中的列表项目</title></head><script language="javascript" type="text/Javascript">var i,txt,val;window.onload = function() { var btnobj = document.getElementById("testbtn"); if(btnobj) { btnobj.onclick = function() { InsertItem() }; } i=0;}function InsertItem(){ i++; var testlistobj = document.getElementById("testlist"); var option; txt = "新增下拉列表项目" + i.toString(); val = txt + i.toString(); option = new Option(txt, val); if(testlistobj) { testlistobj.options.add(option); }}</script><body><select id="testlist"></select><input id="testbtn" type="button" value="增加列表项目"></body></html>
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