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我有以下文件的結果:什麼MongoDB的查詢將限制嵌套列表
{
"username":"test",
"comments":
[
{
"commentId":"53453445",
"message":"Hello this is a message"
},
{
"commentId":"53453445",
"message":"Hello this is a message"
},
{
"commentId":"53453445",
"message":"Hello this is a message"
}
]
}
如何限制的意見,只顯示2項?