laydate实现时间选择器增加选择限制并提供清空限制功能（修改laydate的js文件）
该截图作用为选择器中清空按钮提供清空限制
**html代码**<input placeholder="开始日期" class="hm-search-w208 layer-date" style="width: 100px;" id="create-start-time"><input placeholder="结束日期" class="hm-search-w208 layer-date" style="width: 100px;" id="create-end-time"><button class="btn btn-white btn-sm" type="button"onclick="dropdownSearchFun(this)"data-url="${cxt!}/s/user/userIdentity/list_json"data-tid="table_jq" id="search-btn"><i class="fa fa-search"></i> 查询</button><button class="btn btn-white btn-sm" type="button"onclick="dropdownSearchCleanFun(this)"data-url="${cxt!}/s/user/userIdentity/list_json"data-tid="table_jq" id="clear-btn"><i class="fa fa-retweet"></i> 清空</button>**js代码**var applyStartTime = {elem: "#create-start-time",format: "YYYY-MM-DD",// min: laydate.now(),max: "2099-06-16 23:59:59",istime: true,istoday: false,festival: true, //是否显示节日choose: function (datas) {end.min = datas;end.start = datas}};var applyEndTime = {elem: "#create-end-time",format: "YYYY-MM-DD",// min: laydate.now(),max: "2099-06-16 23:59:59",istime: true,istoday: false,festival: true, //是否显示节日choose: function (datas) {start.max = datas}};laydate(applyStartTime);laydate(applyEndTime);//鼠标按下事件，清空时间限制$("#clear-btn").mousedown(function () {start.max ="", end.min =""})
