diff --git a/problems/1207.独一无二的出现次数.md b/problems/1207.独一无二的出现次数.md
index 027c9f5a..f18af16c 100644
--- a/problems/1207.独一无二的出现次数.md
+++ b/problems/1207.独一无二的出现次数.md
@@ -118,7 +118,23 @@ class Solution:
 Go：
 
 JavaScript：
-
+``` javascript
+var uniqueOccurrences = function(arr) {
+    const count = new Array(2002).fill(0);// -1000 <= arr[i] <= 1000
+    for(let i = 0; i < arr.length; i++){
+        count[arr[i] + 1000]++;// 防止负数作为下标
+    }
+    // 标记相同频率是否重复出现
+    const fre = new Array(1002).fill(false);// 1 <= arr.length <= 1000
+    for(let i = 0; i <= 2000; i++){
+        if(count[i] > 0){//有i出现过
+            if(fre[count[i]] === false) fre[count[i]] = true;//之前未出现过，标记为出现
+            else return false;//之前就出现了，重复出现
+        }
+    }
+    return true;
+};
+```
 -----------------------
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