Commit e83860f

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feat: add js/ts solutions to lc problem: No.0260 (#3383)

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`@@ -238,4 +238,48 @@ public class Solution {`
`238`	`238`
`239`	`239`	`<!-- solution:end -->`
`240`	`240`
	`241`	`+<!-- solution:start -->`
	`242`	`+`
	`243`	`+### 方法二:哈希表`
	`244`	`+`
	`245`	`+<!-- tabs:start -->`
	`246`	`+`
	`247`	`+#### TypeScript`
	`248`	`+`
	`249`	+```ts
	`250`	`+function singleNumber(nums: number[]): number[] {`
	`251`	`+ const set = new Set<number>();`
	`252`	`+`
	`253`	`+ for (const x of nums) {`
	`254`	`+ if (set.has(x)) set.delete(x);`
	`255`	`+ else set.add(x);`
	`256`	`+ }`
	`257`	`+`
	`258`	`+ return [...set];`
	`259`	`+}`
	`260`	+```
	`261`	`+`
	`262`	`+#### JavaScript`
	`263`	`+`
	`264`	+```js
	`265`	`+/**`
	`266`	`+ * @param {number[]} nums`
	`267`	`+ * @return {number[]}`
	`268`	`+ */`
	`269`	`+function singleNumber(nums) {`
	`270`	`+ const set = new Set();`
	`271`	`+`
	`272`	`+ for (const x of nums) {`
	`273`	`+ if (set.has(x)) set.delete(x);`
	`274`	`+ else set.add(x);`
	`275`	`+ }`
	`276`	`+`
	`277`	`+ return [...set];`
	`278`	`+}`
	`279`	+```
	`280`	`+`
	`281`	`+<!-- tabs:end -->`
	`282`	`+`
	`283`	`+<!-- solution:end -->`
	`284`	`+`
`241`	`285`	`<!-- problem:end -->`

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Original file line number	Diff line number	Diff line change
`@@ -236,4 +236,48 @@ public class Solution {`
`236`	`236`
`237`	`237`	`<!-- solution:end -->`
`238`	`238`
	`239`	`+<!-- solution:start -->`
	`240`	`+`
	`241`	`+### Solution 2: Hash Table`
	`242`	`+`
	`243`	`+<!-- tabs:start -->`
	`244`	`+`
	`245`	`+#### TypeScript`
	`246`	`+`
	`247`	+```ts
	`248`	`+function singleNumber(nums: number[]): number[] {`
	`249`	`+ const set = new Set<number>();`
	`250`	`+`
	`251`	`+ for (const x of nums) {`
	`252`	`+ if (set.has(x)) set.delete(x);`
	`253`	`+ else set.add(x);`
	`254`	`+ }`
	`255`	`+`
	`256`	`+ return [...set];`
	`257`	`+}`
	`258`	+```
	`259`	`+`
	`260`	`+#### JavaScript`
	`261`	`+`
	`262`	+```js
	`263`	`+/**`
	`264`	`+ * @param {number[]} nums`
	`265`	`+ * @return {number[]}`
	`266`	`+ */`
	`267`	`+function singleNumber(nums) {`
	`268`	`+ const set = new Set();`
	`269`	`+`
	`270`	`+ for (const x of nums) {`
	`271`	`+ if (set.has(x)) set.delete(x);`
	`272`	`+ else set.add(x);`
	`273`	`+ }`
	`274`	`+`
	`275`	`+ return [...set];`
	`276`	`+}`
	`277`	+```
	`278`	`+`
	`279`	`+<!-- tabs:end -->`
	`280`	`+`
	`281`	`+<!-- solution:end -->`
	`282`	`+`
`239`	`283`	`<!-- problem:end -->`

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`@@ -0,0 +1,10 @@`
	`1`	`+function singleNumber(nums: number[]): number[] {`
	`2`	`+ const set = new Set<number>();`
	`3`	`+`
	`4`	`+ for (const x of nums) {`
	`5`	`+ if (set.has(x)) set.delete(x);`
	`6`	`+ else set.add(x);`
	`7`	`+ }`
	`8`	`+`
	`9`	`+ return [...set];`
	`10`	`+}`

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