使用css3和jquery实现可伸缩搜索框

<div id="search_bar" class="search_bar">
<form id="myform">
<input class="input" placeholder="想搜点什么呢..." type="text" name="key" id="search">
<input class="search_btn" type="submit" value="">
<span class="search_ico"></span>
</form>
</div>

.search_bar{position: relative;margin-: 10px;
width: 0%;min-width: 60px;height: 60px;
float: right;overflow: hidden;
-webkit-transition: width 0.3s;
-moz-transition: width 0.3s;
transition: width 0.3s;
-webkit-backface-visibility: hidden;
background:#162934;
}

.input{
position: absolute;: 0;right: 0;
border: none;outline: none;
width: 98%;height: 60px; line-height:60px;z-index: 10;
font-size: 20px;color: #f9f9f9;background:transparent
}

.search_ico,.search_btn {
width: 60px;height: 60px;display: block;
position: absolute;right: 0;: 0;
padding: 0;margin: 0;line-height: 60px;cursor: pointer;
}

.search_ico{background: #e67e22 url(icon.png) no-repeat 18px 20px;z-index:90;}
.search_open{width: 100% !important; z-index:1002}
#show{position:absolute; padding:20px}

$(function(){
$(".search_ico").click(function(){
$(".search_bar").toggleClass('search_open');
var keys = $("#search").val();
if(keys.length>2){
$("#search").val('');
$("#myform").submit();
}else{
return false;
}
});
});