demo1: 
需求：同時獲取 分類和週期 兩個指標的編碼，傳到後臺。
程式碼：

jsp：
<div class="choose-tab text-center">
    <i class="tips">分類：</i>
    <span class="statisticType cur" code="1">資料總條數</span>
    <span class="statisticType" code="2">資料容量</span>
    <span class="statisticType mr40" code="3">資料表數</span>

    <i class="tips">週期：</i>
    <span class="statisticalPeriod cur" code="1">最近12個月</span>
    <span class="statisticalPeriod" code="2">最近一個月</span>
    <span class="statisticalPeriod" code="3">最近一週</span>
</div>

js ：

$('.statisticType').on('click', function () {
    var currentObj = $(this);
    $(".statisticType").removeClass("cur");
    currentObj.addClass("cur");

    var statisticType = currentObj.attr('code');
    var statisticalPeriod = '';
    var objArray = $('.statisticalPeriod');
    for (var i = 0; i < objArray.length; i++) {
        if ($(objArray[i]).hasClass('cur')) {
            statisticalPeriod = $(objArray[i]).attr('code');
            break;
        }
    }

    if ($.trim(statisticType) == '' && $.trim(statisticalPeriod) == '') {
        layer.msg("引數為空！");
        return false;
    }

    trendInDataVolume(statisticType, statisticalPeriod);
});