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Add js solution to leetcode problem:no.0239

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Original file line number	Diff line number	Diff line change
`@@ -88,6 +88,36 @@`
`88`	`88`
`89`	`89`	```
`90`	`90`
	`91`	`+### JavaScript`
	`92`	`+`
	`93`	+```js
	`94`	`+/**`
	`95`	`+ * @param {number[]} nums`
	`96`	`+ * @param {number} k`
	`97`	`+ * @return {number[]}`
	`98`	`+ */`
	`99`	`+var maxSlidingWindow = function (nums, k) {`
	`100`	`+ let len = nums.length;`
	`101`	`+ if (len < k) return [];`
	`102`	`+ let res = [], win = [];`
	`103`	`+ for (let i = 0; i < k; i++) {`
	`104`	`+ while (win.length > 0 && nums[i] >= nums[win[win.length - 1]])`
	`105`	`+ win.pop();`
	`106`	`+ win.push(i);`
	`107`	`+ }`
	`108`	`+ res.push(nums[win[0]]);`
	`109`	`+ for (let i = k; i < len; i++) {`
	`110`	`+ while (win.length > 0 && nums[i] >= nums[win[win.length - 1]])`
	`111`	`+ win.pop();`
	`112`	`+ if (win.length > 0 && win[0] < i - k + 1)`
	`113`	`+ win.shift();`
	`114`	`+ win.push(i);`
	`115`	`+ res.push(nums[win[0]]);`
	`116`	`+ }`
	`117`	`+ return res;`
	`118`	`+};`
	`119`	+```
	`120`	`+`
`91`	`121`	`### ...`
`92`	`122`
`93`	`123`	```

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Original file line number	Diff line number	Diff line change
`@@ -79,6 +79,36 @@ Window position Max`
`79`	`79`
`80`	`80`	```
`81`	`81`
	`82`	`+### JavaScript`
	`83`	`+`
	`84`	+```js
	`85`	`+/**`
	`86`	`+ * @param {number[]} nums`
	`87`	`+ * @param {number} k`
	`88`	`+ * @return {number[]}`
	`89`	`+ */`
	`90`	`+var maxSlidingWindow = function (nums, k) {`
	`91`	`+ let len = nums.length;`
	`92`	`+ if (len < k) return [];`
	`93`	`+ let res = [], win = [];`
	`94`	`+ for (let i = 0; i < k; i++) {`
	`95`	`+ while (win.length > 0 && nums[i] >= nums[win[win.length - 1]])`
	`96`	`+ win.pop();`
	`97`	`+ win.push(i);`
	`98`	`+ }`
	`99`	`+ res.push(nums[win[0]]);`
	`100`	`+ for (let i = k; i < len; i++) {`
	`101`	`+ while (win.length > 0 && nums[i] >= nums[win[win.length - 1]])`
	`102`	`+ win.pop();`
	`103`	`+ if (win.length > 0 && win[0] < i - k + 1)`
	`104`	`+ win.shift();`
	`105`	`+ win.push(i);`
	`106`	`+ res.push(nums[win[0]]);`
	`107`	`+ }`
	`108`	`+ return res;`
	`109`	`+};`
	`110`	+```
	`111`	`+`
`82`	`112`	`### ...`
`83`	`113`
`84`	`114`	```

Lines changed: 25 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,25 @@`
	`1`	`+/**`
	`2`	`+ * @param {number[]} nums`
	`3`	`+ * @param {number} k`
	`4`	`+ * @return {number[]}`
	`5`	`+ */`
	`6`	`+var maxSlidingWindow = function (nums, k) {`
	`7`	`+ let len = nums.length;`
	`8`	`+ if (len < k) return [];`
	`9`	`+ let res = [], win = [];`
	`10`	`+ for (let i = 0; i < k; i++) {`
	`11`	`+ while (win.length > 0 && nums[i] >= nums[win[win.length - 1]])`
	`12`	`+ win.pop();`
	`13`	`+ win.push(i);`
	`14`	`+ }`
	`15`	`+ res.push(nums[win[0]]);`
	`16`	`+ for (let i = k; i < len; i++) {`
	`17`	`+ while (win.length > 0 && nums[i] >= nums[win[win.length - 1]])`
	`18`	`+ win.pop();`
	`19`	`+ if (win.length > 0 && win[0] < i - k + 1)`
	`20`	`+ win.shift();`
	`21`	`+ win.push(i);`
	`22`	`+ res.push(nums[win[0]]);`
	`23`	`+ }`
	`24`	`+ return res;`
	`25`	`+};`

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