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Update function readme.md #785

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11 changes: 9 additions & 2 deletions 03_Function/readme.md
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Expand Up @@ -25,7 +25,8 @@ Solidity语言的函数非常灵活，可以进行各种复杂操作。在本教
我们先看一下 Solidity 中函数的形式:

```solidity
function <function name>(<parameter types>) {internal|external|public|private} [pure|view|payable] [returns (<return types>)]
function <function name>(<parameter types>) {internal|external|public|private} [pure|view|payable] [virtual|override] [<modifiers>]
[returns (<return types>)]{ <function body> }
```

看着有一些复杂，让我们从前往后逐个解释(方括号中的是可写可不
Expand All @@ -50,7 +51,13 @@ function <function name>(<parameter types>) {internal|external|public|private} [

5. `[pure|view|payable]`：决定函数权限/功能的关键字。`payable`（可支付的）很好理解，带着它的函数，运行的时候可以给合约转入 ETH。`pure` 和 `view` 的介绍见下一节。

6. `[returns ()]`：函数返回的变量类型和名称。
6. `[virtual|override]`: 方法是否可以被重写，或者是否是重写方法。`virtual`用在父合约上，标识的方法可以被子合约重写。`override`用在自合约上，表名方法重写了父合约的方法。

7. `<modifiers>`: 自定义的修饰器，可以有0个或多个修饰器。

8. `[returns ()]`：函数返回的变量类型和名称。

9. `<function body>`: 函数体。

## 到底什么是 `Pure` 和`View`？

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