简单的三级联动demo

<!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":"","value":"北京"},{"id":"","value":"上海"},{"id":"","value":"重庆"},{"id":"","value":"天津"},{"id":"","value":"山东"}];

  for(var i=;i<arr1.length;i++){

    str+="<option value="+arr1[i].id+">"+arr1[i].value+"</option>"

  }

  oone.innerHTML=str;

  var arr2 = {

    '':['101@北京'],

    '':['201@上海'],

    '':['301@重庆'],

    '':['401@天津'],

    '':['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=;j<arrA.length;j++){

      var aaa=arrA[j].split('@');

      str1+="<option value="+aaa[]+">"+aaa[]+"</option>"

    }

    otwo.innerHTML=str1;

    otwo.disabled=false;

    three.innerHTML='<option>请输入区</option>';

    three.disabled='disabled';

  }

  var arr3 = {

    '':['朝阳区','昌平区'],

    '':['宝山区','浦东区'],

    '':['不知道'],

    '':['真的不知道'],

    '':['市中区','历下区','槐荫区'],

    '':['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=;l<arr3[val].length;l++){

      str2+="<option >"+arr3[val][l]+"</option>"

    }

    three.innerHTML=str2;

    three.disabled=false;

  }

</script>

</body>

</html>
截图如下：
巴特西

简单的三级联动demo

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