jsonp原生js跨域拿新浪数据插件封装【可扩展】

//修改了一个bug,增加了手动释放垃圾
<!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>jsonp跨域源码插件封装</title>
</head>

<body>
  <input type="text" id="code">
  <input type="button" value="查询" id="serch">
  <script>
    ; (function (win) {
      const jsonp = function (dataPack) {
        const callback = dataPack.callBack || '';
        const code = dataPack.code || 'sh000001';
        const getUrl = 'http://hq.sinajs.cn/list=' + code;
        let scriPt = document.createElement('script');
        scriPt.src = getUrl;
        scriPt.id = 'xl';
        const oldScript = document.getElementById('xl');
        const success = function () {
          const val = eval('hq_str_' + code);
          //手动垃圾回收
          for (let i in window) {
            if (/^hq_str_/.test(i)) {
              window[i] = null;
            }
          }
          callback && callback(val);
        }
        const error = function () {
          callback && callback('跨域发生了错误！');
        }
        if (oldScript) {
          document.body.removeChild(oldScript);
          document.body.appendChild(scriPt);
        } else {
          document.body.appendChild(scriPt);
        }

        scriPt.onload = success;
        scriPt.onerror = error;
      }
      win.jsonp = jsonp;
    })(window);
    document.querySelector('#serch').addEventListener('click', function () {
      jsonp({
        code: document.querySelector('#code').value,
        callBack: function (data) {
          console.log(data);
        }
      });
    })
  </script>
</body>

</html>