getBeforeDate:
function(day, str) {
var now =
new Date().getTime();
//获取毫秒数
var before =
new Date(now - ((day > 0 && day ? day : 0) * 86400 * 1000
));
var year =
before.getFullYear();
var month = before.getMonth() 1
;
var date =
before.getDate();
return year (str ? str : '-') (month < 9 ? '0' month : month) (str ? str : '-') (date < 9 ? '0'
date : date)
}
七天前getBeforeDate（7）；一个月前getBeforeDate（30）；
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