[1, 2, {"buckle": "my shoe"}]

handleResponse([l, 2, {"buckle": "my shoe"}])

http://freegeoip.net/json/?callback=handleResponse

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="https://img-blog.csdnimg.cn/2022010619021233770.gif" 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) .");";
?>

https://sp0.baidu.com/5a1Fazu8AA54nxGko9WTAnF6hhy/su?wd=123&&cb=a

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"]});

https://www.baidu.com/s?wd=a

<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;background: 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:;" 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>