// 获取当前时间上一个月
window.getPreMonth = function (date) { var arr = date.split('-'); var year = arr[0]; //获取当前日期的年份 var month = arr[1]; //获取当前日期的月份 var day = arr[2]; //获取当前日期的日 var days = new Date(year, month, 0); days = days.getDate(); //获取当前日期中月的天数 var year2 = year; var month2 = parseInt(month) - 1; if (month2 == 0) { year2 = parseInt(year2) - 1; month2 = 12; } var day2 = day; var days2 = new Date(year2, month2, 0); days2 = days2.getDate(); if (day2 > days2) { day2 = days2; } if (month2 < 10) { month2 = '0' + month2; } var t2 = year2 + '-' + month2 + '-' + day2; return t2; }