solution

Author: liuhanqu

README.md

@@ -17,6 +17,7 @@ LeetCode Problems' Solutions in JavaScript
 ## medium
 
 1.  [数组中的第 K 个最大元素](./algorithms/medium/findKthLargest/findKthLargest.js)
-1.  [分类颜色](./algorithms/medium/sortColors/sortColors.js)
+2.  [分类颜色](./algorithms/medium/sortColors/sortColors.js)
+3.  [寻找峰值](./algorithms/medium/findPeakElement/findPeakElement.js)
 
 ## hard

algorithms/medium/findPeakElement/findPeakElement.js

@@ -0,0 +1,13 @@
+// description: https://leetcode-cn.com/explore/interview/card/top-interview-questions-medium/50/sorting-and-searching/99/
+// 寻找峰值
+
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+var findPeakElement = function(nums) {
+  for (var i = 0, len = nums.length; i < len - 1; i++) {
+    if (nums[i] > nums[i + 1]) return i;
+  }
+  return nums.length - 1;
+};