Merge pull request #141 from fusunx/master

添加 0046.全排列 Javascript

problems/0046.全排列.md

@@ -206,14 +206,32 @@ func backtrack(nums,pathNums []int,used []bool){
     }
 }
 
-func permute(nums []int) [][]int {
-    //var pathNums []int
-    pathNums:=make([]int,0)
-    var used=make([]bool,len(nums))
-    result=[][]int{}
-    backtrack(nums,pathNums,used)
+Javascript:
+```Javascript
+
+var permute = function(nums) {
+    let result = []
+    let path = []
+    function backtracing(used) {
+        if(path.length === nums.length) {
+            result.push(path.slice(0))
+            return
+        }
+        for(let i = 0; i < nums.length; i++) {
+            if(used[nums[i]]) {
+                continue
+            }
+            used[nums[i]] = true
+            path.push(nums[i])
+            backtracing(used)
+            path.pop()
+            used[nums[i]] = false
+        }
+    }
+    backtracing([])
     return result
-}
+};
+
 ```