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function gM(num) { var new_month = 0; var now_date = new Date(); var year = now_date.getFullYear(); var month = now_date.getMonth(); if ((month - num) < 0) { for (var i = 1; i < 100; i++) { //此处为最大100年以内判断 var new_month = new_month + 12; if (((new_month + month) - num) > 0) { var new_year = year - Number(i); var new_month = (new_month + month) - num; break; }; }; } else { var new_year = year; var new_month = month - num; } return (new_year.toString() + "-" + new_month.toString() + "-" + "1" + " 00:00:00"); }
本文转自 ninnycalf 51CTO博客，原文链接:http://blog.51cto.com/314258/1828954
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