for (var i = 1; i <= 30; i++) {
db.wechatAttention.save({_class:"la.xiaoxiao.manager.wechat.entity.WechatAttentionEntity",ghId:"gh_"+ObjectId().valueOf(),openId:ObjectId().valueOf(),createDate:new Date(new Date()- Math.ceil(Math.random()*(29526208000)+1)),temple:"A"});
}
原文：http://www.cnblogs.com/wind90/p/5059482.html