function handleResponse(response){
  alert ("You're at IP address " + response.ip + ", which is in " + response.city + ", "+ response.region_name);
}
var script = document.createElement("script");
script.src = "http://freegeoip.net/json/?callback=handLeResponse"; document.body.insertBefore(script, document.body.firstChild);

<button id="btn">获取信息</button>
<img id="img" height="16" style="display:none" src="data:image/gif;base64,R0lGODlhIAAgALMAAP///7Ozs/v7+9bW1uHh4fLy8rq6uoGBgTQ0NAEBARsbG8TExJeXl/39/VRUVAAAACH/C05FVFNDQVBFMi4wAwEAAAAh+QQFBQAAACwAAAAAIAAgAAAE5xDISSlLrOrNp0pKNRCdFhxVolJLEJQUoSgOpSYT4RowNSsvyW1icA16k8MMMRkCBjskBTFDAZyuAEkqCfxIQ2hgQRFvAQEEIjNxVDW6XNE4YagRjuBCwe60smQUDnd4Rz1ZAQZnFAGDd0hihh12CEE9kjAEVlycXIg7BAsMB6SlnJ87paqbSKiKoqusnbMdmDC2tXQlkUhziYtyWTxIfy6BE8WJt5YEvpJivxNaGmLHT0VnOgGYf0dZXS7APdpB309RnHOG5gDqXGLDaC457D1zZ/V/nmOM82XiHQjYKhKP1oZmADdEAAAh+QQFBQAAACwAAAAAGAAXAAAEchDISasKNeuJFKoHs4mUYlJIkmjIV54Soypsa0wmLSnqoTEtBw52mG0AjhYpBxioEqRNy8V0qFzNw+GGwlJki4lBqx1IBgjMkRIghwjrzcDti2/Gh7D9qN774wQGAYOEfwCChIV/gYmDho+QkZKTR3p7EQAh+QQFBQAAACwBAAAAHQAOAAAEchDISWdANesNHHJZwE2DUSEo5SjKKB2HOKGYFLD1CB/DnEoIlkti2PlyuKGEATMBaAACSyGbEDYD4zN1YIEmh0SCQQgYehNmTNNaKsQJXmBuuEYPi9ECAU/UFnNzeUp9VBQEBoFOLmFxWHNoQw6RWEocEQAh+QQFBQAAACwHAAAAGQARAAAEaRDICdZZNOvNDsvfBhBDdpwZgohBgE3nQaki0AYEjEqOGmqDlkEnAzBUjhrA0CoBYhLVSkm4SaAAWkahCFAWTU0A4RxzFWJnzXFWJJWb9pTihRu5dvghl+/7NQmBggo/fYKHCX8AiAmEEQAh+QQFBQAAACwOAAAAEgAYAAAEZXCwAaq9ODAMDOUAI17McYDhWA3mCYpb1RooXBktmsbt944BU6zCQCBQiwPB4jAihiCK86irTB20qvWp7Xq/FYV4TNWNz4oqWoEIgL0HX/eQSLi69boCikTkE2VVDAp5d1p0CW4RACH5BAUFAAAALA4AAAASAB4AAASAkBgCqr3YBIMXvkEIMsxXhcFFpiZqBaTXisBClibgAnd+ijYGq2I4HAamwXBgNHJ8BEbzgPNNjz7LwpnFDLvgLGJMdnw/5DRCrHaE3xbKm6FQwOt1xDnpwCvcJgcJMgEIeCYOCQlrF4YmBIoJVV2CCXZvCooHbwGRcAiKcmFUJhEAIfkEBQUAAAAsDwABABEAHwAABHsQyAkGoRivELInnOFlBjeM1BCiFBdcbMUtKQdTN0CUJru5NJQrYMh5VIFTTKJcOj2HqJQRhEqvqGuU+uw6AwgEwxkOO55lxIihoDjKY8pBoThPxmpAYi+hKzoeewkTdHkZghMIdCOIhIuHfBMOjxiNLR4KCW1ODAlxSxEAIfkEBQUAAAAsCAAOABgAEgAABGwQyEkrCDgbYvvMoOF5ILaNaIoGKroch9hacD3MFMHUBzMHiBtgwJMBFolDB4GoGGBCACKRcAAUWAmzOWJQExysQsJgWj0KqvKalTiYPhp1LBFTtp10Is6mT5gdVFx1bRN8FTsVCAqDOB9+KhEAIfkEBQUAAAAsAgASAB0ADgAABHgQyEmrBePS4bQdQZBdR5IcHmWEgUFQgWKaKbWwwSIhc4LonsXhBSCsQoOSScGQDJiWwOHQnAxWBIYJNXEoFCiEWDI9jCzESey7GwMM5doEwW4jJoypQQ743u1WcTV0CgFzbhJ5XClfHYd/EwZnHoYVDgiOfHKQNREAIfkEBQUAAAAsAAAPABkAEQAABGeQqUQruDjrW3vaYCZ5X2ie6EkcKaooTAsi7ytnTq046BBsNcTvItz4AotMwKZBIC6H6CVAJaCcT0CUBTgaTg5nTCu9GKiDEMPJg5YBBOpwlnVzLwtqyKnZagZWahoMB2M3GgsHSRsRACH5BAUFAAAALAEACAARABgAAARcMKR0gL34npkUyyCAcAmyhBijkGi2UW02VHFt33iu7yiDIDaD4/erEYGDlu/nuBAOJ9Dvc2EcDgFAYIuaXS3bbOh6MIC5IAP5Eh5fk2exC4tpgwZyiyFgvhEMBBEAIfkEBQUAAAAsAAACAA4AHQAABHMQyAnYoViSlFDGXBJ808Ep5KRwV8qEg+pRCOeoioKMwJK0Ekcu54h9AoghKgXIMZgAApQZcCCu2Ax2O6NUud2pmJcyHA4L0uDM/ljYDCnGfGakJQE5YH0wUBYBAUYfBIFkHwaBgxkDgX5lgXpHAXcpBIsRADs=" alt="loading">
<div id="result"></div>
<script>
var add = (function(){
  var counter = 0;
  return function(){
    return ++counter;
  }
})();
function loadScript(url){
  loadScript.mark = 'load';
  var script = document.createElement("script");
  script.type = "text/javascript";
  script.src = url;
  script.onload = function(){
    img.style.display = 'none';
    btn.removeAttribute('disabled');
  }
  document.body.appendChild(script);
}
function test(data){
  var sum = add() - 1;
  if(sum < data.length ){
   result.innerHTML += data[sum];  
  }
}
btn.onclick = function(){
  img.style.display = 'inline-block';
  btn.setAttribute('disabled','');
  loadScript('https://www.webhuochai.com/test/getData.php?callback=test');
}
</script>

<?php
function test_input($data) {
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}
$arr = [1,2,3,4,5];
echo test_input($_GET['callback']) ."(" .json_encode($arr) .");";
?>

a({q:"123",p:false,s:["12306","12306铁路客户服务中心","12308汽车订票官网","12306火车票网上订票官网","12333","12315","12345","12333社保查询网","123网址之家","12366"]});

<style>
body{margin: 0;}
ul{margin: 0;padding: 0;list-style: none;}
a{color:inherit;text-decoration: none;}
input{padding: 0;border: 0;}
.box{width: 340px;height: 38px;border: 2px solid gray;}
.con{overflow: hidden;}
.input{float: left;width: 300px;height: 38px;}
.search{width: 38px;height: 38px;float: right;backgroundnull:url('http://sandbox.runjs.cn/uploads/rs/26/ddzmgynp/search.png') 0 -38px;}
.list{position: absolute;width: 298px;border: 1px solid #e6e8e9; overflow: hidden;}
.in{line-height: 30px;border-bottom: 1px solid lightblue;cursor:pointer;text-indent: 1em;}
.list .in:last-child{margin-bottom: -1px;}
.in:hover{background-color: #f9f9f9;}
</style>
<div class="box" id="box">
  <div class="con">
    <input class="input" id="search">
    <a target="_blank" id="btn" href="javascript:;" rel="external nofollow" class="search"></a>
  </div>
  <ul class="list" id="list"></ul>    
</div> 
<script>
function loadScript(url){
  loadScript.mark = 'load';
  var script = document.createElement("script");
  script.type = "text/javascript";
  script.src = url;
  document.body.appendChild(script);
}
function callback(data){
  if(data){
    var arr = data.s;
    var html = '';
    for(var i = 0,len = arr.length; i < len; i++){
      html+= "<li class='in'><a href='https://www.baidu.com/s?wd="+ arr[i]+"' target='_blank' style='display:block'>" + arr[i]+ "</a></li>"
    }
    list.innerHTML = html;    
  }
}
search.onkeyup = function(e){
  e = e || event;
  if(e.keyCode == '13'){
    window.open('https://www.baidu.com/s?wd=' + this.value);
  }
  if(this.value){
    if(search.data != this.value){
      btn.setAttribute('href','https://www.baidu.com/s?wd=' + this.value);
      var that = this;
      loadScript("https://sp0.baidu.com/5a1Fazu8AA54nxGko9WTAnF6hhy/su?wd=" + that.value + "&&cb=callback");
    }
  }else{
    list.innerHTML = '';
  }
  search.data = this.value;
}
search.onclick = function(e){
  e = e || event;
  list.style.display = 'block';
  if(e.stopPropagation){
    e.stopPropagation();
  }else{
    e.cancelBubble = true;
  }
}
document.onclick = function(){
   list.style.display = 'none';
}
</script>