jsonp的原理
主要是利用動態創建 script 標籤請求後端接口地址，然後傳遞 callback 參數，後端接 callback，後端經過數據處理，返回 callback 函數 調用的形式，callback 中的參數就是 json
<!DOCTYPE html>
<html lang="zh">
<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>
</head>
<body>
<input type="" id="username" oninput="search()" />
</body>
<script src="jquery-3.4.1.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
function search()
{
var wd=$("#username").val();
//console.log(wd);
getJson("https://sp0.baidu.com/5a1Fazu8AA54nxGko9WTAnF6hhy/su?wd="+wd,'get')
}
function getJson(url,callback)
{
var script=document.createElement('script');
script.type="text/javascript";
script.src=url+'&cb='+callback;
document.querySelector('head').appendChild(script);
}
function get(data)
{
console.log(data)
}
</script>
</html>