swift
2018-05-02 本文已影响0人
whereandhere
```
let b =10
var a =5
a =10
// b = 9 Cannot assign to value: 'b' is a 'let' constant
```
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```
let b =10
var a =5
a =10
// b = 9 Cannot assign to value: 'b' is a 'let' constant
```
