一个p中有两个span 点击是让span的class属性变成class=" btn btn-large btn-primary "另一个 span class=" btn btn-large"
<p>
<span class="btn btn-large"></span>
<span class="btn btn-large"></span>
</p>
<script>$(function() {
$("span").on("click", function() {
$(this).addClass("btn-primary").siblings().removeClass("btn-primary");
});
});</script>
