var dynamicLoading = {

  css: function(path){

 if(!path || path.length === 0){

  throw new Error('argument "path" is required !');

 }

 var head = document.getElementsByTagName('head')[0];

    var link = document.createElement('link');

    link.href = path;

    link.rel = 'stylesheet';

    link.type = 'text/css';

    head.appendChild(link);

  },

  js: function(path){

 if(!path || path.length === 0){

  throw new Error('argument "path" is required !');

 }

 var head = document.getElementsByTagName('head')[0];

    var script = document.createElement('script');

    script.src = path;

    script.type = 'text/javascript';

    head.appendChild(script);

  }

}

//动态加载 CSS 文件

dynamicLoading.css("test.css");

//动态加载 JS 文件

dynamicLoading.js("test.js");