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  • 地区三级联动

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>Document</title>
    
        <style>
                select{
                     100px;
                    float: left;
                    margin-right: 10px;
                }
            </style>
    </head>
    <body>
        <select name="" id="may01">
            <option value="0">请选择省份</option>
            <option value="四川">四川</option>
            <option value="云南">云南</option>
            <option value="贵州">贵州</option>
        </select>
        <select name="" id="may02"></select>
        <select name="" id="may03"></select>
    
        <script>
            var may01 = document.getElementById("may01");
            var may02 = document.getElementById("may02");
            var may03 = document.getElementById("may03");
    
            may01.onchange=function(){
                var val = this.value;
               if(val=='四川'){
                   var sichuan=["成都市","绵阳市","乐山市"];
                   var str="<option value='0'>"+"请选择城市"+"</option>";
                   for(var i=0;i<sichuan.length;i++){
                       str+='<option value="'+sichuan[i]+'">'+sichuan[i]+'</option>'
                   }
                   may02.innerHTML=str
               }
            };
            may02.onchange=function(){
                var val=this.value;
                if(val=="成都市"){
                    var chengdu=["青羊区","锦江区","武侯区"];
                    var str="<option value='0'>"+"请选择城市"+"</option>";
                    for(var i=0;i<chengdu.length;i++){
                        str+='<option value="'+chengdu[i]+'">'+chengdu[i]+'</option>'
                    }
                    may03.innerHTML=str
                }else{
                    may03.innerHTML=""
                }
            }      
            
        </script>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/yang656/p/9832322.html
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