虽然body是JS中的DOM技术中所有浏览器支持的属性，但在我们的代码编写中，还是会碰到document.is null问题
问题的原因很简单，是因为我们在body标签前就加载了js，此时还没有body元素
问题的解决办法就是把调用到document.body的JS代码移到body标签代码结束之后。
zhangzi
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xinglianxlxl：
对我有用，谢谢
Spring 定时任务之 @Scheduled cron表达式 -
cb_2017：
...
Spring 定时任务之 @Scheduled cron表达式 -
a251628111：
谢谢分享
Spring 定时任务之 @Scheduled cron表达式 -
hl174：
确实是这个问题 不知道谁把数据库改了
java.lang.IllegalArgumentException: Timestamp format must be yyyy-mm-dd hh:mm:ss -
gotosuzhou：
zhangzi 写道lylshr 写道顶，大哥你真强啊晕死，这 ...
数据库是SQLServer2008,出现'limit' 附近有语法错误
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