var VERSION='2.8.2';
      var url=`https://unpkg.com/layui@${VERSION}/dist/css/layui.css`;

      var predefine=['#16baaa'];
      var newColors=['#1e9fff'];
      var style='';

      // 事件
      util.on('lay-on',{
        'change': function() {
          $.get(url).done(function(res) {
            style=res.replace(/@font-face{[^}]+}/,'');
            layer.msg('ok')
            var newStyle = '';
             predefine.forEach((color,index) => {
               newStyle=style.replace(new RegExp(color,'ig'),newColors[index])
             })
             addStyle('customTheme',newStyle);
          })
        }
      );

      function addStyle(id,cssStr) {
        var el=document.getElementById(id)||document.createElement('style');
        if(!el.isConnected) {
          el.type='text/css';
          el.id=id;
          document.head.appendChild(el);
        }
        el.textContent=cssStr;
      }