.plussub {
	width:120px;
	height:32px;
	border:1px solid #ccc;
	background:#fff;
	margin:0 auto;
}
.plussub span {
	width:30px;
	height:30px;
	float:left;
	text-align:center;
	line-height:30px;
	cursor:pointer;
}
.plussub .sub {
	border-right:1px solid #ccc;
}
.plussub .plus {
	border-left:1px solid #ccc;
}
.plussub input[type="text"] {
	border:none;
	height:30px;
	width:56px;
	text-align:center;
	float:left;
	line-height:30px;
}
多用于产品加减用的框