<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title></title> </head> <body> <select id="one"> <option>请输入省份</option> </select> <select id="two"> <option>请输入市</option> </select> <select id="three"> <option>请输入区</option> </select> <script type="text/javascript"> var oone=document.getElementById("one"); var otwo=document.getElementById("two"); var three=document.getElementById("three"); var str=''; otwo.disabled=true; three.disabled=true; var arr1=[{"id":"1","value":"北京"},{"id":"2","value":"上海"},{"id":"3","value":"重庆"},{"id":"4","value":"天津"},{"id":"5","value":"山东"}]; for(var i=0;i<arr1.length;i++){ str+="<option value="+arr1[i].id+">"+arr1[i].value+"</option>" } oone.innerHTML=str; var arr2 = { '1':['101@北京'], '2':['201@上海'], '3':['301@重庆'], '4':['401@天津'], '5':['501@济南','502@青岛'] }; oone.onchange=function(){ var val=this.value; console.log('val',val) var arrA = arr2[val]; console.log('arrA',arrA) var str1='<option>请输入市</option>'; for(var j=0;j<arrA.length;j++){ var aaa=arrA[j].split('@'); str1+="<option value="+aaa[0]+">"+aaa[1]+"</option>" } otwo.innerHTML=str1; otwo.disabled=false; three.innerHTML='<option>请输入区</option>'; three.disabled='disabled'; } var arr3 = { '101':['朝阳区','昌平区'], '201':['宝山区','浦东区'], '301':['不知道'], '401':['真的不知道'], '501':['市中区','历下区','槐荫区'], '502':['市南区','市北区','崂山区'] }; otwo.onchange = function(){ var val=this.value; console.log( this.value); var str2='<option>请输入区</option>'; console.log(val) for(var l=0;l<arr3[val].length;l++){ str2+="<option >"+arr3[val][l]+"</option>" } three.innerHTML=str2; three.disabled=false; } </script> </body> </html>
截图如下：