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‎01_HelloWeb3/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎02_ValueTypes/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎03_Function/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎04_Return/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎05_DataStorage/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎06_ArrayAndStruct/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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这一讲，我们将介绍`Solidity`中的两个重要变量类型：数组（`array`）和结构体（`struct`）。

‎07_Mapping/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎08_InitialValue/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎09_Constant/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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这一讲，我们介绍Solidity中和常量相关的两个关键字，`constant`（常量）和`immutable`（不变量）。状态变量声明这两个关键字之后，不能在初始化后更改数值。这样做的好处是提升合约的安全性并节省`gas`。

‎10_InsertionSort/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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这一讲，我们将介绍`Solidity`中的控制流，然后讲如何用`Solidity`实现插入排序（`InsertionSort`），一个看起来简单，但实际上很容易写出`bug`的程序。

‎11_Modifier/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎12_Event/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎13_Inheritance/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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这一讲，我们介绍`Solidity`中的继承（`inheritance`），包括简单继承，多重继承，以及修饰器（`Modifier`）和构造函数（`Constructor`）的继承。

‎14_Interface/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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这一讲，我们用`ERC721`的接口合约为例介绍`Solidity`中的抽象合约（`abstract`）和接口（`interface`），帮助大家更好的理解`ERC721`标准。
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## 抽象合约
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如果一个智能合约里至少有一个未实现的函数，即某个函数缺少主体`{}`中的内容，则必须将该合约标为`abstract`，不然编译会报错；另外，未实现的函数需要加`virtual`，以便子合约重写。拿我们之前的[插入排序合约](https://github.com/AmazingAng/WTFSolidity/tree/main/10_InsertionSort)为例，如果我们还没想好具体怎么实现插入排序函数，那么可以把合约标为`abstract`，之后让别人补写上。
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如果一个智能合约里至少有一个未实现的函数，即某个函数缺少主体`{}`中的内容，则必须将该合约标为`abstract`，不然编译会报错；另外，未实现的函数需要加`virtual`，以便子合约重写。拿我们之前的[插入排序合约](https://github.com/AmazingAng/WTF-Solidity/tree/main/10_InsertionSort)为例，如果我们还没想好具体怎么实现插入排序函数，那么可以把合约标为`abstract`，之后让别人补写上。
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```solidity
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abstract contract InsertionSort{

‎15_Errors/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎16_Overloading/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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}
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```
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最终重载函数在经过编译器编译后，由于不同的参数类型，都变成了不同的函数选择器（selector）。关于函数选择器的具体内容可参考[WTF Solidity极简入门: 29. 函数选择器Selector](https://github.com/AmazingAng/WTFSolidity/tree/main/29_Selector)。
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最终重载函数在经过编译器编译后，由于不同的参数类型，都变成了不同的函数选择器（selector）。关于函数选择器的具体内容可参考[WTF Solidity极简入门: 29. 函数选择器Selector](https://github.com/AmazingAng/WTF-Solidity/tree/main/29_Selector)。
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以 `Overloading.sol` 合约为例，在 Remix 上编译部署后，分别调用重载函数 `saySomething()` 和 `saySomething(string memory something)`，可以看到他们返回了不同的结果，被区分为不同的函数。
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‎17_Library/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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这一讲，我们用`ERC721`的引用的库合约`Strings`为例介绍`Solidity`中的库合约（`Library`），并总结了常用的库合约。

‎18_Import/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎19_Fallback/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎20_SendETH/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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`Solidity`有三种方法向其他合约发送`ETH`，他们是：`transfer()`，`send()`和`call()`，其中`call()`是被鼓励的用法。

‎21_CallContract/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎22_Call/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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我们曾在[第20讲：发送ETH](https://github.com/AmazingAng/WTFSolidity/tree/main/20_SendETH)那一讲介绍过利用`call`来发送`ETH`，这一讲我们将介绍如何利用它调用合约。
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我们曾在[第20讲：发送ETH](https://github.com/AmazingAng/WTF-Solidity/tree/main/20_SendETH)那一讲介绍过利用`call`来发送`ETH`，这一讲我们将介绍如何利用它调用合约。
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## Call
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`call` 是`address`类型的低级成员函数，它用来与其他合约交互。它的返回值为`(bool, bytes memory)`，分别对应`call`是否成功以及目标函数的返回值。
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- `call`是`Solidity`官方推荐的通过触发`fallback`或`receive`函数发送`ETH`的方法。
30-
- 不推荐用`call`来调用另一个合约，因为当你调用不安全合约的函数时，你就把主动权交给了它。推荐的方法仍是声明合约变量后调用函数，见[第21讲：调用其他合约](https://github.com/AmazingAng/WTFSolidity/tree/main/21_CallContract)
30+
- 不推荐用`call`来调用另一个合约，因为当你调用不安全合约的函数时，你就把主动权交给了它。推荐的方法仍是声明合约变量后调用函数，见[第21讲：调用其他合约](https://github.com/AmazingAng/WTF-Solidity/tree/main/21_CallContract)
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- 当我们不知道对方合约的源代码或`ABI`，就没法生成合约变量；这时，我们仍可以通过`call`调用对方合约的函数。
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### `call`的使用规则

‎23_Delegatecall/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎24_Create/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎25_Create2/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎26_DeleteContract/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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19-
所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎27_ABIEncode/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎28_Hash/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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18-
所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎29_Selector/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
1717

18-
所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
18+
所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎30_TryCatch/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
1717

18-
所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
18+
所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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‎31_ERC20/readme.md

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社区：[Discord](https://discord.gg/5akcruXrsk)｜[微信群](https://docs.google.com/forms/d/e/1FAIpQLSe4KGT8Sh6sJ7hedQRuIYirOoZK_85miz3dw7vA1-YjodgJ-A/viewform?usp=sf_link)｜[官网 wtf.academy](https://wtf.academy)
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所有代码和教程开源在 github: [github.com/AmazingAng/WTFSolidity](https://github.com/AmazingAng/WTFSolidity)
19+
所有代码和教程开源在 github: [github.com/AmazingAng/WTF-Solidity](https://github.com/AmazingAng/WTF-Solidity)
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