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Merge pull request AmazingAng#195 from 0xc25fee20/patch-2
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Update readme.md
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AmazingAng authored Sep 3, 2022
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`solidity`支持利用`import`关键字导入其他源代码中的合约,让开发更加模块化。
`solidity`支持利用`import`关键字导入其他合约中的全局符号(简单理解为外部源代码),让开发更加模块化。一般不具体指定则将导入文件的所有全局符号到当前全局作用域中

## `import`用法

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import './Yeye.sol';
```

- 通过源文件网址导入网上的合约,例子:
- 通过源文件网址导入网上的合约的全局符号,例子:
```
// 通过网址引用
import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Address.sol';
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import '@openzeppelin/contracts/access/Ownable.sol';
```

- 通过`全局符号`导入特定的合约,例子:
- 通过指定`全局符号`导入合约特定的全局符号,例子:
```solidity
import {Yeye} from './Yeye.sol';
```
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