[javascript] async load script #js #async

baidu_statistic.js

(function() {
  var hm = document.createElement("script");
  hm.src = "https://hm.baidu.com/hm.js?430525c455fa119f047f66ba9aa5e3b1";
  var s = document.getElementsByTagName("script")[0]; 
  s.parentNode.insertBefore(hm, s);
})();

insert_footer_script.js

(function() {
  var hm = document.createElement("script");
  hm.src = "https://hm.baidu.com/hm.js?430525c455fa119f047f66ba9aa5e3b1";
  document.body.appendChild(hm);
})();

insert_remote_script.js

var script = document.createElement('script');
script.src = 'xxxxxxxxxxxxxxxx.viz.js'; // 加载脚本路径
script.onload = function(){
  // 代码。。。。
};

// 在头部插入 script
var head = document.getElementsByTagName('head')[0];
head.appendChild(script);