<!DOCTYPE HTML>

 <html>

    <head>

       <meta charset = "utf-8">

       <title>JS实现联想自动补齐功能</title>

       <style>

          * { box-sizing: border-box; }

          #container{

             position:relative;

             top:50px;

             left:30%;

           /*为了好看一点定个位*/

         }

         form{

              padding:6px;

              position:absolute;

              top:200px;

              left:50px;

        }

         #search{

          border: 1px solid transparent;

          background-color: #f1f1f1;

          padding: 10px;

          font-size: 16px;

       }

         button{

             background-color: DodgerBlue;

             color: #fff;

             width:60px;

             height:40px;

             padding:10px;

       }

        //好了虽然丑了点，更能还是有了

      .listclass {

          position: absolute;

          border: 1px solid #d4d4d4;

          border-bottom: none;

          border-top: none;

          z-index: 99;

          top: 100%;

          left: 0;

          right: 0;

        }

       .listclass div {

           padding: 10px;

           cursor: pointer;

           background-color: #fff;

           border-bottom: 1px solid #d4d4d4;

        }

          .listclass div:hover {

           background-color: #e9e9e9;

       }

        .listactive {

            background-color: DodgerBlue !important;

            color: #ffffff;

       }

       </style>

    </head>

    <body>

      <div id="container">

      <h3>HTML5的表单是有自动不全功能的，（所以可以只做输入和数据对比过滤就可以）<h3>

      <h3>这里我们先把补齐更能关闭了用autocomplete属性来实现</h3>

      <form autocomplete="off" action="https://www.baidu.com/s?"  id>

           <div  >

                 <input id="search" name="search" placeholder="输入国家或者地区的英文名">

                 <button type="submit" >提交</button>

           </div>

      </form>

      </div>

      <script>

         //筛选函数

         function search(arr){

          //将数据传入，预处理一下

          var currentFocus;//用来计算输入几个

          var inp=document.getElementById("search");

          //当输入时，开始筛选,注册一个输入

          inp.addEventListener("input",function(event){

           var a,b,i,val=this.value;

           //当失去焦点后关闭下拉列表

           closeAll();

           if(!val){return false;}

           currentFocus=-1;

           //把数据例表搞出来

           a=document.createElement("div");

           a.setAttribute("id",this.id+"list");

           a.setAttribute("class","listclass");

           //添加这个div

           inp.parentNode.appendChild(a);

           //开始循环匹配数据

           for(i=0;i<arr.length;i++){

             //这个只能顺序匹配，匹配第一个后第二个有效继续，无效为空，

             if (arr[i].substr(0, val.length).toUpperCase() == val.toUpperCase()) {

               b = document.createElement("div");

               b.innerHTML = "<strong>" + arr[i].substr(0, val.length) + "</strong>";

               b.innerHTML += arr[i].substr(val.length);

               b.innerHTML += "<input type='hidden' value='" + arr[i] + "'>";

               b.addEventListener("click", function(e) {

               inp.value = this.getElementsByTagName("input")[0].value;

               console.log(this)

               closeAll();

           });

          a.appendChild(b);

     }

   }

 });

      //按键按下时将数据放到输入框

        inp.addEventListener("keydown", function(e) {

           var x = document.getElementById(this.id + "list");

           if (x) x = x.getElementsByTagName("div");

           if (e.keyCode == 40) {

           currentFocus++;

           addActive(x);

       } else if (e.keyCode == 38) {

          currentFocus--;

          addActive(x);

       } else if (e.keyCode == 13) {

          e.preventDefault();

         if (currentFocus > -1) {

           if (x) x[currentFocus].click();

         }

       }

   });

       function addActive(x) {

     if (!x) return false;

     removeActive(x);

     if (currentFocus >= x.length) currentFocus = 0;

     if (currentFocus < 0) currentFocus = (x.length - 1);

     x[currentFocus].classList.add("listactive");

   }

 //输入框删除已经输入的字符，往后匹配

   function removeActive(x) {

     for (var i = 0; i < x.length; i++) {

       x[i].classList.remove("listactive");

     }

   }

  //失去焦点就关闭列表

   function closeAll(elmnt) {

     //全部删去

     var x = document.getElementsByClassName("listclass");

     for (var i = 0; i < x.length; i++) {

       if (elmnt != x[i] && elmnt != inp) {

         x[i].parentNode.removeChild(x[i]);

       }

     }

   }

   //点击列表外也删除

   document.addEventListener("click", function (e) {

       closeAll(e.target);

       });  

       }

 //数据

  var countries = ["Afghanistan","Albania","Algeria","Andorra","Angola","Anguilla","Antigua & 

 Barbuda","Argentina","Armenia","Aruba","Australia","Austria","Azerbaijan","Bahamas","Bahrain","Bang

 ladesh","Barbados","Belarus","Belgium","Belize","Benin","Bermuda","Bhutan","Bolivia","Bosnia & 

 Herzegovina","Botswana","Brazil","British Virgin Islands","Brunei","Bulgaria","Burkina 

 Faso","Burundi","Cambodia","Cameroon","Canada","Cape Verde","Cayman Islands","Central Arfrican 

 Republic","Chad","Chile","China","Colombia","Congo","Cook Islands","Costa Rica","Cote D 

 Ivoire","Croatia","Cuba","Curacao","Cyprus","Czech 

 Republic","Denmark","Djibouti","Dominica","Dominican Republic","Ecuador","Egypt","El 

 Salvador","Equatorial Guinea","Eritrea","Estonia","Ethiopia","Falkland Islands","Faroe 

 Islands","Fiji","Finland","France","French Polynesia","French West 

 Indies","Gabon","Gambia","Georgia","Germany","Ghana","Gibraltar","Greece","Greenland","Grenada","Gu

 am","Guatemala","Guernsey","Guinea","Guinea Bissau","Guyana","Haiti","Honduras","Hong Kong 

 China","Hungary","Iceland","India","Indonesia","Iran","Iraq","Ireland","Isle of 

 Man","Israel","Italy","Jamaica","Japan","Jersey","Jordan","Kazakhstan","Kenya","Kiribati","Kosovo",

 "Kuwait","Kyrgyzstan","Laos","Latvia","Lebanon","Lesotho","Liberia","Libya","Liechtenstein","Lithua

 nia","Luxembourg","Macau 

 China","Macedonia","Madagascar","Malawi","Malaysia","Maldives","Mali","Malta","Marshall 

 Islands","Mauritania","Mauritius","Mexico","Micronesia","Moldova","Monaco","Mongolia","Montenegro",

 "Montserrat","Morocco","Mozambique","Myanmar","Namibia","Nauro","Nepal","Netherlands","Netherlands 

 Antilles","New Caledonia","New Zealand","Nicaragua","Niger","Nigeria","North 

 Korea","Norway","Oman","Pakistan","Palau","Palestine","Panama","Papua New 

 Guinea","Paraguay","Peru","Philippines","Poland","Portugal","Puerto 

 Rico","Qatar","Reunion","Romania","Russia","Rwanda","Saint Pierre & Miquelon","Samoa","San 

 Marino","Sao Tome and Principe","Saudi Arabia","Senegal","Serbia","Seychelles","Sierra 

 Leone","Singapore","Slovakia","Slovenia","Solomon Islands","Somalia","South Africa","South 

 Korea","South Sudan","Spain","Sri Lanka","St Kitts & Nevis","St Lucia","St 

 Vincent","Sudan","Suriname","Swaziland","Sweden","Switzerland","Syria","Taiwan 

 China","Tajikistan","Tanzania","Thailand","Timor L'Este","Togo","Tonga","Trinidad & 

 Tobago","Tunisia","Turkey","Turkmenistan","Turks & Caicos","Tuvalu","Uganda","Ukraine","United Arab 

 Emirates","United Kingdom","United States of America","Uruguay","Uzbekistan","Vanuatu","Vatican 

 City","Venezuela","Vietnam","Virgin Islands (US)","Yemen","Zambia","Zimbabwe"];

 /*运行一下函数*/

 search(countries);

      </script>

    </body>

 </html>

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