添加 977.有序数组的平方 Javascript 版本

problems/0977.有序数组的平方.md

@@ -198,6 +198,31 @@ impl Solution {
     }
 }
 ```
+Javascript：
+```Javascript
+/**
+ * @desc two pointers solution
+ * @link https://leetcode-cn.com/problems/squares-of-a-sorted-array/
+ * @param nums Array  e.g. [-4,-1,0,3,10]
+ * @return {array}    e.g. [0,1,9,16,100]
+ */
+const sortedSquares = function (nums) {
+    let res = []
+    for (let i = 0, j = nums.length - 1; i <= j;) {
+      const left = Math.abs(nums[i])
+      const right = Math.abs(nums[j])
+      if (right > left) {
+        // push element to the front of the array
+        res.unshift(right * right)
+        j--
+      } else {
+        res.unshift(left * left)
+        i++
+      }
+    }
+    return res
+  }
+```
 
 -----------------------
 * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)