动态加载js、css

loadJs.js

export const addStyle = (src: string) => {
  let styles = document.createElement('link');
  styles.rel = 'stylesheet';
  styles.type = 'text/css';
  styles.media = 'screen';
  styles.href = src;
  document.getElementsByTagName('head')[0].appendChild(styles);
};

export const addScript = async (src: string) => {
  let script = document.createElement('script');
  script.setAttribute('src', src);
  document.body.appendChild(script);

  return new Promise((resolve) => {
    script.addEventListener('load', () => {
      resolve(1);
    });
  });
};