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feat: add js solution to lc problem: No.1929.Concatenation of Array (doocs#509)

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`@@ -82,6 +82,20 @@ class Solution {`
`82`	`82`	`}`
`83`	`83`	```
`84`	`84`
	`85`	`+### JavaScript`
	`86`	`+`
	`87`	+```js
	`88`	`+/**`
	`89`	`+ * @param {number[]} nums`
	`90`	`+ * @return {number[]}`
	`91`	`+ */`
	`92`	`+var getConcatenation = function(nums) {`
	`93`	`+ let ans = nums.slice();`
	`94`	`+ ans.splice(nums.length, 0, ...nums);`
	`95`	`+ return ans;`
	`96`	`+};`
	`97`	+```
	`98`	`+`
`85`	`99`	`### C++`
`86`	`100`
`87`	`101`	```cpp

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`@@ -67,6 +67,20 @@ class Solution {`
`67`	`67`	`}`
`68`	`68`	```
`69`	`69`
	`70`	`+### JavaScript`
	`71`	`+`
	`72`	+```js
	`73`	`+/**`
	`74`	`+ * @param {number[]} nums`
	`75`	`+ * @return {number[]}`
	`76`	`+ */`
	`77`	`+var getConcatenation = function(nums) {`
	`78`	`+ let ans = nums.slice();`
	`79`	`+ ans.splice(nums.length, 0, ...nums);`
	`80`	`+ return ans;`
	`81`	`+};`
	`82`	+```
	`83`	`+`
`70`	`84`	`### C++`
`71`	`85`
`72`	`86`	```cpp

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`@@ -0,0 +1,9 @@`
	`1`	`+/**`
	`2`	`+ * @param {number[]} nums`
	`3`	`+ * @return {number[]}`
	`4`	`+ */`
	`5`	`+ var getConcatenation = function(nums) {`
	`6`	`+ let ans = nums.slice();`
	`7`	`+ ans.splice(nums.length, 0, ...nums);`
	`8`	`+ return ans;`
	`9`	`+};`

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