diff --git a/src/leecode/javascript/78.子集.js b/src/leecode/javascript/78.子集.js
new file mode 100644
index 0000000..871cd69
--- /dev/null
+++ b/src/leecode/javascript/78.子集.js
@@ -0,0 +1,26 @@
+/*
+ * @lc app=leetcode.cn id=78 lang=javascript
+ *
+ * [78] 子集
+ */
+
+// @lc code=start
+/**
+ * @param {number[]} nums
+ * @return {number[][]}
+ */
+var subsets = function (nums) {
+  const ret = [];
+  dp(nums, 0, [], ret);
+  return ret;
+};
+
+const dp = function (nums, index, cur, ret) {
+  if (index === nums.length) {
+    ret.push(cur);
+    return;
+  }
+  dp(nums, index + 1, cur.slice(), ret);
+  dp(nums, index + 1, cur.slice().concat(nums[index]), ret);
+};
+// @lc code=end