<form role="search" method="get" id="searchform" action="<?php echo home_url('/');?>">
<div>
<label class="screen-reader-text" for="s">搜索:</label>
<input type="text" value="" name="s" id="s" placeholder="<?php the_search_query();?>"/>
<input type="submit" id="searchsubmit" value="搜索"/>
</div>
</form>