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docs: 【0055右旋字符串】JavaScript部分实现

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`@@ -295,7 +295,37 @@ int main()`
`295`	`295`	```
`296`	`296`
`297`	`297`	`### JavaScript:`
	`298`	+```javascript
	`299`	`+// JS中字符串内不可单独修改`
	`300`	`+`
	`301`	`+// 右旋转`
	`302`	`+function reverseLeftWords(s, k) {`
	`303`	`+ const reverse = (sList, start, end) => {`
	`304`	`+ for (let i = start, j = end; i < j; i++, j--) {`
	`305`	`+ [sList[i], sList[j]] = [sList[j], sList[i]];`
	`306`	`+ }`
	`307`	`+ }`
	`308`	`+ const sList = Array.from(s);`
	`309`	`+ reverse(sList, 0, sList.length - k - 1);`
	`310`	`+ reverse(sList, sList.length - k, sList.length - 1);`
	`311`	`+ reverse(sList, 0, sList.length - 1);`
	`312`	`+ return sList.join('');`
	`313`	`+}`
`298`	`314`
	`315`	`+// 左旋转`
	`316`	`+var reverseLeftWords = function(s, n) {`
	`317`	`+ const reverse = (sList, start, end) => {`
	`318`	`+ for (let i = start, j = end; i < j; i++, j--) {`
	`319`	`+ [sList[i], sList[j]] = [sList[j], sList[i]];`
	`320`	`+ }`
	`321`	`+ }`
	`322`	`+ const sList = s.split('');`
	`323`	`+ reverse(sList, 0, n - 1);`
	`324`	`+ reverse(sList, n, sList.length - 1);`
	`325`	`+ reverse(sList, 0, sList.length - 1);`
	`326`	`+ return sList.join('');`
	`327`	`+};`
	`328`	+```
`299`	`329`
`300`	`330`	`### TypeScript:`
`301`	`331`

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