发布于 2015-09-14 15:11:58 | 122 次阅读 | 评论: 0 | 来源: 网络整理
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$and
Takes an array one or more values and returns true if all of
the values in the array are true. Otherwise $and
returns false.
注解
$and uses short-circuit logic: the operation
stops evaluation after encountering the first false
expression.