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Update generator.md
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@ -221,7 +221,7 @@ g[Symbol.iterator]() === g
## next方法的参数
`yield`句本身没有返回值，或者说总是返回`undefined`。`next`方法可以带一个参数，该参数就会被当作上一个`yield`语句的返回值。
`yield`语句本身没有返回值，或者说总是返回`undefined`。`next`方法可以带一个参数，该参数就会被当作上一个`yield`语句的返回值。
```javascript
function* f() {