function clickExchangeUI(key,val){
    if($(key).hasClass("current_k")) return;
    else{
        $(".current_k").removeClass("active");
        $(".current_v").css({"display":"none"});
        $(".current_k").removeClass("current_k");
        $(".current_v").removeClass("current_v");
        $(key).addClass("active");
        $(val).css({"display":""});
        $(key).addClass("current_k");
        $(val).addClass("current_v");
    }
}
$(".user_k").click(function(){clickExchangeUI(".user_k",".user_v")});
$(".device_k").click(function(){clickExchangeUI(".device_k",".device_v")});