javascript实现二级联动列表
<!DOCTYPE HTML><html><head><title>二级联动列表</title><metacharset="utf-8"/><style>.hide{display: none;}</style></head><body><selectname="provs"><option>—选择省—</option><option>北京市</option><option>天津市</option><option>河北省</option></select><selectname="cities"class="hide"></select><script>var cities=[[{"name":'东城区',"value":101},{"name":'西城区',"value":102},{"name":'海淀区',"value":103},{"name":'朝阳区',"value":104}],[{"name":'河东区',"value":201},{"name":'河西区',"value":202},{"name":'南开区',"value":303}],[{"name":'石家庄市',"value":301},{"name":'廊坊市',"value":302},{"name":'保定市',"value":303},{"name":'唐山市',"value":304},{"name":'秦皇岛市',"value":304}]];var provs=document.getElementsByName("provs")[0];
provs.onchange=function(){var city=document.getElementsByName("cities")[0];if(this.selectedIndex==0){
city.className="hide";return;}
city.innerHTML="";var i=this.selectedIndex-1;var frag=document.createDocumentFragment();var option=document.createElement("option");
option.innerHTML="-选择市-";
frag.appendChild(option);for(var ctof cities[i]){var option=document.createElement("option");
option.innerHTML=ct.name;
frag.appendChild(option);}
city.appendChild(frag);
city.className="";}</script></body></html>