<script language="JavaScript" type="text/javascript"><!--/* * 說明：將指定下拉列表的選項值清空 * 轉(zhuǎn)自：Gdong Elvis ( http://www.gdcool.net ) * * @param {String || Object]} selectObj 目標(biāo)下拉選框的名稱或?qū)ο螅仨?*/ function removeOptions(selectObj) { if (typeof selectObj != 'object') { selectObj = document.getElementById(selectObj); } // 原有選項計數(shù) var len = selectObj.options.length; for (var i=0; i < len; i++) { // 移除當(dāng)前選項 selectObj.options[0] = null; } } /* * @param {String || Object]} selectObj 目標(biāo)下拉選框的名稱或?qū)ο螅仨?* @param {Array} optionList 選項值設(shè)置 格式：[{txt:'北京', val:'010'}, {txt:'上海', val:'020'}] ，必須 * @param {String} firstOption 第一個選項值，如：“請選擇”，可選，值為空 * @param {String} selected 默認(rèn)選中值，可選 */ function setSelectOption(selectObj, optionList, firstOption, selected) { if (typeof selectObj != 'object') { selectObj = document.getElementById(selectObj); } // 清空選項 removeOptions(selectObj); // 選項計數(shù) var start = 0; // 如果需要添加第一個選項 if (firstOption) { selectObj.options[0] = new Option(firstOption, ''); // 選項計數(shù)從 1 開始 start ++; } var len = optionList.length; for (var i=0; i < len; i++) { // 設(shè)置 option selectObj.options[start] = new Option(optionList[i].txt, optionList[i].val); // 選中項 if(selected == optionList[i].val)  { selectObj.options[start].selected = true; } // 計數(shù)加 1 start ++; } } //--></script><script language="JavaScript" type="text/javascript">var cityArr = [];cityArr['江蘇省'] =[ {txt:'南京', val:'南京'}, {txt:'無錫', val:'無錫'}, {txt:'徐州', val:'徐州'}, {txt:'蘇州', val:'蘇州'}, {txt:'南通', val:'南通'}, {txt:'淮陰', val:'淮陰'}, {txt:'揚州', val:'揚州'}, {txt:'鎮(zhèn)江', val:'鎮(zhèn)江'}, {txt:'常州', val:'常州'} ];cityArr['浙江省'] =[ {txt:'杭州', val:'杭州'}, {txt:'寧波', val:'寧波'}, {txt:'溫州', val:'溫州'}, {txt:'湖州', val:'湖州'} ];function setCity(province){ setSelectOption('city', cityArr[province], '-請選擇-');}</script> <select name="province" id="province" onchange="if(this.value != '') setCity(this.options[this.selectedIndex].value);"> <option value="">-請選擇-</option> <option value="江蘇省">江蘇省</option> <option value="浙江省">浙江省</option> </select> 省 <select name="city" id="city"> <option value="">-請選擇-</option> </select> 市