# 事件

事件在执行交易期间发出。每个 Move 模块都可以定义自己的事件，并选择在执行模块时何时发出事件。例如，在代币转账期间，发送方和接收方的帐户将分别发出 `SentEvent` 和 `Centevent`。这些数据存储在账本中，可以通过 REST 接口的 [Get 事件句柄](https://fullnode.devnet.aptoslabs.com/spec.html#/operations/get_events_by_event_handle)查询。

假设一个 `0xc40f1c9b9fdc204cf77f68c9bb7029b0abbe8ad9e5561f7794964076a4fbdcfd` 帐户向另一个帐户发送了代币，可以对 REST 接口进行以下查询：`https://fullnode.devnet.aptoslabs.com/accounts/c40f1c9b9fdc204cf77f68c9bb7029b0abbe8ad9e5561f7794964076a4fbdcfd/events/0x1::coin::CoinStore<0x1::aptos_coin::AptosCoin>/withdraw_events`。将输出存储在该帐户上所有的 `WithdrawEvent`，看起来是这样的：

```
[{
  "key":"0x0000000000000000caa60eb4a01756955ab9b2d1caca52ed",
  "sequence_number":"0",
  "type":"0x1::coin::WithdrawEvent",
  "data":{
    "amount":"1000"
  }
}]
```

每个注册事件都有一个独特的 `key`。密钥 `0x0000000000000000c40f1c9b9fdc204cf77f68c9bb7029b0abbe8ad9e5561f7794964076a4fbdcfd` 导向注册在帐户 `0xc40f1c9b9fdc204cf77f68c9bb7029b0abbe8ad9e5561f7794964076a4fbdcfd` 上的事件`0x1::coin::CoinStore<0x1::aptos_coin::AptosCoin>/sent_events`。可以使用此密钥直接进行事件查询，例如`https://fullnode.devnet.aptoslabs.com/events/0000000000000000c40f1c9b9fdc204cf77f68c9bb7029b0abbe8ad9e5561f7794964076a4fbdcfd`。

这些代表事件流，或事件列表，每个条目包含从`0` 开始的顺序增加的 `sequence_number`，一个 `type` 和 `data`。每个事件都必须由某种`type`来定义。可能有多个事件由相同或类似的`type`定义，特别是在使用泛型时。事件与`data`相关联。一般原则是包括所有必要的数据，以了解更改数据和事件的交易执行前后对基础资源的更改。


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