复制
1const jsonp = ({ url, params, callbackName }) => {
2  const generateUrl = () => {
3    let dataSrc = '';
4    for (let key in params) {
5      if (Object.prototype.hasOwnProperty.call(params, key)) {
6        dataSrc += `${key}=${params[key]}&`;
7      }
8    }
9    dataSrc += `callback=${callbackName}`;
10    return `${url}?${dataSrc}`;
11  }
12  return new Promise((resolve, reject) => {
13    const scriptEle = document.createElement('script');
14    scriptEle.src = generateUrl();
15    document.body.appendChild(scriptEle);
16    window[callbackName] = data => {
17      resolve(data);
18      document.removeChild(scriptEle);
19    }
20  })
21}
22