输出效果：

首先创建时间对象：

var nowDate = new Date();

第二步使用三元运算符计算时间：

var nowMonth = nowDate.getFullYear() + "-" + (parseInt(nowDate.getMonth() + 1) < 10 ? "0" + parseInt(nowDate.getMonth() + 1):parseInt(nowDate.getMonth() + 1)) + "-01";
var afterMonth = nowDate.getFullYear() + "-" + (parseInt(nowDate.getMonth() + 2) < 10? "0" + parseInt(nowDate.getMonth() + 2):parseInt(nowDate.getMonth() + 2)) + "-01";