js获取当前月的第一天和最后一天

var sysDate = new Date();
获取当前月的第一天
var startDateTime = sysDate.getFullYear() + ‘-’ + (sysDate.getMonth() + 1) + ‘-’ + 1 + ’ ’ +‘0:0:0’;
获取当前月的最后一天
var lastDate = new Date(new Date(sysDate.getFullYear(),sysDate.getMonth()+1,1).getTime()-10006060*24);
endDateTime = lastDate.getFullYear() + ‘-’ + (lastDate.getMonth() + 1) + ‘-’ + lastDate.getDate() + ’ ’ + ‘23:59:59’;