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docs: 修改第十三讲获取函数选择器方法 #157

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docs: 修改第十三讲获取函数选择器方法 #157

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12 changes: 7 additions & 5 deletions 13_EncodeCalldata/readme.md
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Original file line number Diff line number Diff line change
Expand Up @@ -31,20 +31,22 @@ tags:

```js
// 利用abi生成
const interface = ethers.Interface(abi)
const iface = ethers.Interface.from(abi);
// 或者
const iface = new ethers.Interface(abi);

// 直接从contract中获取
const interface2 = contract.interface
const iface = contract.interface;
```

接口类封装了一些编码解码的方法。与一些特殊的合约交互时（比如代理合约），你需要编码参数、解码返回值：

**注意**：相关函数必须包含在`abi`中。

- `getSighash()`：获取函数选择器（function selector），参数为函数名或函数签名。
- `getFunction("函数名").selector`：获取函数选择器（function selector），参数为函数名或函数签名。

```js
interface.getSighash("balanceOf");
// '0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'
iface.getFunction("balanceOf").selector;
```
- `encodeDeploy()`：编码构造器的参数，然后可以附在合约字节码的后面。
```js
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