0376.摆动序列.md Javascript

problems/0376.摆动序列.md

@@ -143,7 +143,23 @@ Python：
 Go：
 
 
-
+Javascript:
+```Javascript
+var wiggleMaxLength = function(nums) {
+    if(nums.length <= 1) return nums.length
+    let result = 1
+    let preDiff = 0
+    let curDiff = 0
+    for(let i = 0; i <= nums.length; i++) {
+        curDiff = nums[i + 1] - nums[i]
+        if((curDiff > 0 && preDiff <= 0) || (curDiff < 0 && preDiff >= 0)) {
+            result++
+            preDiff = curDiff
+        }
+    }
+    return result
+};
+```
 
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