添加0189.旋转数组 js版本

problems/0189.旋转数组.md

@@ -131,6 +131,22 @@ class Solution:
 ## JavaScript
 
 ```js
+var rotate = function (nums, k) {
+  function reverse(nums, i, j) {
+    while (i < j) {
+      [nums[i],nums[j]] = [nums[j],nums[i]]; // 解构赋值
+      i++;
+      j--;
+    }
+  }
+  let n = nums.length;
+  k %= n;
+  if (k) {
+    reverse(nums, 0, n - 1);
+    reverse(nums, 0, k - 1);
+    reverse(nums, k, n - 1);
+  }
+};
 ```
 
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