获取下标实现导航切换jquery代码

var lis = $(".proDetail_contentnav li");
for(var i = 0; i < lis.length; i++) {
lis[i].index = i;
$(".proDetail_contentnav li").click(function() {
$(".proDetail_contentnav li").css({
"color": "#3c3c3c",
"background": "transparent"
});
$(this).css({
"color": "#ffffff",
"background": "#2078D2"
});
k = this.index;
$(".proDetail_content").hide();
$(".proDetail_content").eq(k).show();
})
}

此处只粘贴js代码，自设置css布局