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需求：定时删除mongodb指定库1个月前的数据
bat文件内容：
@echo off E:mongodbbinmongo MyDB -u myuser -p mypassword -quiet removedata.js
js文件内容：
var date = new Date();
date.setDate(date.getDate()-30);
db.bmdMessage.remove({'senddate' : {$lt:date}});