网页按钮没有id与name两个属性怎么点击
<form id="search_form" action="http://www.sogou.com/sogou" autocomplete="off" target="_blank" accept-charset="utf-8">
<span class="search_hidden">
<input type="hidden" name="pid" id="pid" value="sogou-site-664dd858db942cad" /> <input type="hidden" name="ie" id="ie" value="utf8" />
</span>
<div class="search_con">
<a id="search_logo" href="http://www.sogou.com/index.php?pid=sogou-site-664dd858db942cad" cid="38371" class="logo_sogou"></a>
<div class="ipt_wrap">
<b class="shadow_x"></b>
<b class="shadow_y"></b>
<input class="ipt_search" id="search_keyword" name="query" value="" autocomplete="off" />
</div>
<span class="btn_wrap">
<b class="shadow_l"></b>
<b class="shadow_r"></b>
<button type="submit" class="btn_search">搜索一下</button> </span>