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下拉框连动的小例子（.htm版）
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广告招租，e-mail:yesize@hotmail.com < html > < head > < title >List< /title > < meta http-equiv=Content-Type content=text/html; charset=gb2312 > < script LANGUAGE=javascript > < !-- var onecount; onecount=0; subcat = new Array(); subcat[0] = new Array(徐汇区,01,001); subcat[1] = new Array(嘉定区,01,002); subcat[2] = new Array(黄浦区,01,003); subcat[3] = new Array(南昌市,02,004); subcat[4] = new Array(九江市,02,005); subcat[5] = new Array(上饶市,02,006); onecount=6; function changelocation(locationid) { document.myform.smalllocation.length = 0; var locationid=locationid; var i; document.myform.smalllocation.options[0] = new Option(====所有地区====,); for (i=0;i < onecount; i++) { if (subcat[i][1] == locationid) { document.myform.smalllocation.options[document.myform.smalllocation.length] = new Option(subcat[i][0], subcat[i][2]); } } } //-- > < /script > < /head > < body > < form name=myform method=post > < select name=biglocation onChange=changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value) > < option value=01 selected >上海< /option > < option value=02 >江西< /option > < /select > < select name=smalllocation > < option selected value= >==所有地区==< /option > < /select > < /form > < script LANGUAGE=javascript > < !-- changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value); //-- > < /script > < /body > < /html >
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