方法函数：
function FormatDate (strTime) { ???????????var date = new Date(strTime); ???????????return date.getFullYear()+"-"+(date.getMonth()+1)+"-"+date.getDate(); ???????}调用方法：
???????????var today = new Date(); ???????????var today_time = ?FormatDate(today); ???????????if(today_time>‘2018-4-25‘){ ???????????????alert(‘活动已结束‘); ???????????????return false; ???????????}【转】js 判断今天日期是否超过指定日期
原文地址：https://www.cnblogs.com/gushengyan/p/8947815.html