在js里加载同目录下的css文件

用于在同一文件包下封装组件方便

!(() => {
  var getPath = function () {
    var jsPath = document.currentScript ? document.currentScript.src : function(){
      var js = document.scripts, last = js.length - 1, src;
      for(var i = last; i > 0; i--){
        if(js[i].readyState === 'interactive'){
          src = js[i].src;
          break;
        }
      }
      return src || js[last].src;
    }();
    return jsPath.substring(0, jsPath.lastIndexOf('/') + 1);
  }()
  const link = document.createElement('link')
  link.href = `${getPath}index.css`
  link.rel = 'stylesheet'
  document.head.appendChild(link)
})()