//在原有日期基础上,增加days天数(指定起始日期,如:2019-12-09,在该日期上增加天数,如:3天,计算增加天数后的日期,如:2019-12-12) function addDate(date, days) { if (days == undefined || days == '') { days = 0; } var date = new Date(date.replace(/-/g, "/")); date.setDate(date.getDate() + parseInt(days)); var month = date.getMonth() + 1; var day = date.getDate(); return date.getFullYear() + '-' + getFormatDate(month) + '-' + getFormatDate(day); } // 格式化日期“天”的显示,如果是1位数,则在前面加上“0” eg:7 ---> 07 function getFormatDate(arg) { if (arg == undefined || arg == '') { return ''; } var re = arg + ''; if (re.length < 2) { re = '0' + re; } return re; }