动态加载JS

fuweihan00

于 2020-04-22 16:13:25 发布

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分类专栏： web前端文章标签： javascript

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/**
   * 动态加载JS
   * @param {string} url 脚本地址
   * @param {function} callback  回调函数
   */
  export default function dynamicLoadJs (url, callback) {
    var head = document.getElementsByTagName('head')[0];
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = url;
    if (typeof (callback) === 'function') {
      script.onload = script.onreadystatechange = function () {
        if (!this.readyState || this.readyState === 'loaded' || this.readyState === 'complete') {
          callback();
          script.onload = script.onreadystatechange = null;
        }
      }
    }
    head.appendChild(script);
  }