block嵌套不支持
{{extend './lay_out.art'}}
{{block ‘block1’}}
  <header class="search">
    {{block 'header1'}}
    {{/block}}
    {{block 'header2'}}
    {{/block}}
    {{block 'header3'}}
    {{/block}}
    {{block 'header4'}}
    {{/block}}
    {{block 'header5'}}
    {{/block}}
  </header>
{{/block}}

在下一个art文件中：content.art
{{block 'header1'}}
  <div class="search_item grow">
    <input class="input border" type="text" placeholder="请输入搜索关键字">
  </div>
  {{/block}}

这么写似乎不生效