話不多說，請看代碼：
<!DOCTYPE html><html><head> <meta charset="utf-8" /> <title></title></head><body><select id="one"> <option>請輸入省份</option></select><select id="two"> <option>請輸入市</option></select><select id="three"> <option>請輸入區</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":"重慶"},{"id":"4","value":"天津"},{"id":"5","value":"山東"}]; 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@重慶'], '4':['401@天津'], '5':['501@濟南','502@青島'] }; oone.onchange=function(){ var val=this.value; var arrA = arr2[val]; var str1='<option>請輸入市</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>請輸入區</option>'; three.disabled='disabled'; } var arr3 = { '101':['朝陽區','昌平區'], '201':['寶山區','浦東區'], '301':['不知道'], '401':['真的不知道'], '501':['市中區','歷下區','槐蔭區'], '502':['市南區','市北區','嶗山區'] }; otwo.onchange = function(){ var val=this.value; console.log( this.value); var str2='<option>請輸入區</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>以上就是本文的全部內容，希望本文的內容對大家的學習或者工作能帶來一定的幫助，同時也希望多多支持錯新站長站！
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