fix wrongly.

Author: honpery

JS/JS-ch.md

@@ -1309,7 +1309,7 @@ function test() {
 //  parseInt('3', 2) -> NaN
 ```
 
-`FlapMap` 和 `map` 的作用几乎是相同的，但是对于多维数组来说，会将原数组降维。可以将 `FlapMap` 看成是 `map` + `flatten` ，目前该函数在浏览器中还不支持。
+`FlatMap` 和 `map` 的作用几乎是相同的，但是对于多维数组来说，会将原数组降维。可以将 `FlatMap` 看成是 `map` + `flatten` ，目前该函数在浏览器中还不支持。
 
 ```js
 [1, [2], 3].flatMap((v) => v + 1)

JS/JS-en.md

@@ -1203,7 +1203,7 @@ The effect of `Map` is to generate a new array, iterate over the original array,
 //  parseInt('3', 2) -> NaN
 ```
 
-The effect of `FlapMap` is almost the same with a `Map`, but the original array will be flatten for multidimensional arrays. You can think of `FlapMap` as a `map` and a `flatten`, which is currently not supported in browsers.
+The effect of `FlatMap` is almost the same with a `Map`, but the original array will be flatten for multidimensional arrays. You can think of `FlatMap` as a `map` and a `flatten`, which is currently not supported in browsers.
 
 ```js
 [1, [2], 3].flatMap((v) => v + 1)