本文實例講述了javascript省市級聯功能實現方法。分享給大家供大家參考，具體如下：
初步實現方法：
<html><head><script language="javascript"> function changecity(){ var province = document.form1.selprovince.value; var newoption1,newoption2; switch(province){ case "四川省": newoption1 = new Option("成都市", "chengdu"); newoption2 = new Option("綿陽市", "mianyang"); break; case "湖北省" : newoption1= new Option("武漢市","wuhan"); newoption2= new Option("襄樊市","xiangfan"); break; case "山東省" : newoption1= new Option("青島市","qingdao"); newoption2= new Option("煙臺市","yantai"); break; } document.form1.selcity.options.length=0; document.form1.selcity.options.add(newoption1); document.form1.selcity.options.add(newoption2); }</script></head><form name="form1" action="" method="post"> <select name="selprovince" onchange="changecity()"> <option>--請選擇開戶帳號的省份--</option> <OPTION value="四川省">四川省</OPTION> <OPTION value="山東省">山東省</OPTION> <OPTION value="湖北省">湖北省</OPTION> </select> <select name="selcity"> <option>--請選擇開戶帳號的城市--</option> </select></form></html>改進實現方法：
<html><head><script language="javascript"> function changecity(){ var cityList = new Array(); cityList[0]=['成都', '綿陽', '德陽', '自貢']; cityList[1]=['濟南', '青島', '淄博', '棗莊']; cityList[2]=['武漢', '宜昌', '荊州', '襄樊']; var pindex = document.form1.selprovince.selectedIndex-1; var newoption1; document.form1.selcity.options.length = 0; for(var j in cityList[pindex]){ newoption1 = new Option(cityList[pindex][j], cityList[pindex][j]); document.form1.selcity.options.add(newoption1); } }</script></head><form name="form1" action="" method="post"> <select name="selprovince" onchange="changecity()"> <option>--請選擇省份--</option> <OPTION value="四川省">四川省</OPTION> <OPTION value="山東省">山東省</OPTION> <OPTION value="湖北省">湖北省</OPTION> </select> <select name="selcity"> <option>--請選擇城市--</option> </select></form></html>改進方法2：
<html><head><script language="javascript"> function citychange(){ var cityList = new Array(); cityList['遼寧省'] = ['沈陽','鞍山','大連']; cityList['山東省'] = ['濟南','煙臺','蓬萊']; cityList['山西省'] = ['太原','大同','平遙']; var pindex = document.form1.selprovince.value; var newoption1; document.form1.selcity.options.length = 0; for(var i in cityList[pindex]){ newoption1 = new Option(cityList[pindex][i],cityList[pindex][i]); document.form1.selcity.options.add(newoption1); } }</script></head><form action="" name="form1" method="post"> <select name="selprovince" onchange="citychange()"> <option>請選擇省份</option> <OPTION value="遼寧省">遼寧省</OPTION> <OPTION value="山東省">山東省</OPTION> <OPTION value="山西省">山西省</OPTION> </select> <select name="selcity"> <option>請選擇城市</option> </select></form></html>希望本文所述對大家JavaScript程序設計有所幫助。
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