Javascript擷取本周，本月，本季，本年，上月，上周，上季，去年，上二周，上二月

Javascript擷取本周，本月，本季，本年，上月，上周，上季，去年，上二周，上二月的時間段

function dateChange(name){var beginTimeObject = document.getElementById("beginTime");var endTimeObject = document.getElementById("endTime");var beginTime;var endTime;var now = new Date();var month = now.getMonth();var year = now.getFullYear();var day = now.getDate();var wday = now.getDay();switch(name){case "tweek": //本周var day  = now.getDay();now.setDate(now.getDate() - (day -1));beginTime = formatDate(now);now.setDate(now.getDate() + 6);endTime = formatDate(now);break;case "tmonth":  //本月now.setDate(1);beginTime = formatDate(now);var days = getDays(now);now.setDate(days);endTime = formatDate(now);break;case "tquarter":   //本季var m = now.getMonth() + 1;var q = parseInt((m + 2 ) / 3 ); //得到第幾季m = q * 3 - 2;  //得到季的首月份now.setMonth(m-1);now.setDate(1);beginTime = formatDate(now);now.setMonth(now.getMonth() + 3);now.setDate(0);endTime = formatDate(now);break;case "tyear":    //本年now.setMonth(0);now.setDate(1);beginTime = formatDate(now);now.setMonth(11);now.setDate(31);endTime = formatDate(now);        break;case "today":    //今天beginTime = formatDate(now);endTime = beginTime;break;case "pweek":    //上周var day  = now.getDay();now.setDate(now.getDate() - (day -1) - 7 );beginTime = formatDate(now);now.setDate(now.getDate() + 6);endTime = formatDate(now);break;case "pmonth":    //上月now.setDate(1);now.setMonth(now.getMonth() -1 );beginTime = formatDate(now);var days = getDays(now);now.setDate(days);endTime = formatDate(now);break;case "pquarter":    //上季var m = now.getMonth() + 1;var q = parseInt((m + 2 ) / 3 ); //得到第幾季m = q * 3 - 2;  //得到季的首月份m = m-3 ; //上季now.setMonth(m-1);now.setDate(1);beginTime = formatDate(now);now.setMonth(now.getMonth() + 3);now.setDate(0);endTime = formatDate(now);        break;case "pyear":    //去年now.setFullYear(now.getFullYear() -1 );now.setMonth(0);now.setDate(1);beginTime = formatDate(now);now.setMonth(11);now.setDate(31);endTime = formatDate(now);            break;case "p2week":    //上二周var day  = now.getDay();now.setDate(now.getDate() - (day -1) - 7 *2);beginTime = formatDate(now);now.setDate(now.getDate() + 6 + 7);endTime = formatDate(now);            break;case "p2month":    //上二月now.setDate(1);now.setMonth(now.getMonth() -1*2 );beginTime = formatDate(now);now.setMonth(now.getMonth() + 2);now.setDate(0);endTime = formatDate(now);break;case "customize":    //自訂beginTime = "";endTime = "";break;}beginTimeObject.value = beginTime;endTimeObject.value = endTime;}

 引自：http://hi.baidu.com/xixitie/item/b3d98eeca9d9633987d9de66