调整

Author: liuwenai

listtree.js

@@ -10,12 +10,22 @@ let list = [
     { id: 8, name: '部门H', parentId: 4 }
 ];
 
-
 function convert(list) {
     let tree = []
+    // const map = list.reduce((res, v) => (res[v.id] = v, res), {})
     const map = list.reduce((res, v) => (res[v.id] = v, res), {})
-    console.log(map)
-    
+
+    for(const item of list){
+        if(item.parentId ===0 ){
+            tree.push(item)
+            continue
+        }
+        if(item.parentId in map){
+            const parent = map[item.parentId]
+            parent.children = parent.children || []
+            parent.children.push(item)
+        }
+    }
 
     return tree
 }

number.js

@@ -64,9 +64,26 @@ function hander(obj){
 console.log(hander(obj))
 
 
-var arr = [1,2,3]
-for (let i = 0; i < arr.length; i++) {
-    setTimeout(function(){
-        console.log(i)
-    },3000)    
-}
+// var arr = [1,2,3]
+// for (let i = 0; i < arr.length; i++) {
+//     setTimeout(function(){
+//         console.log(i)
+//     },3000)    
+// }
+
+
+
+// 中位数
+const num1 = [1,5],num2 = [4]
+let arrr = []
+arrr = arrr.concat(num1,num2)
+console.log(arrr)
+let nums = arrr.sort(function(a,b){return a-b})
+var median
+if(nums.length %2){
+    median = nums[Math.floor(nums.length / 2)]
+}else{
+    var m = nums.length / 2
+    median = (nums[m - 1] + nums[m]) / 2
+}
+console.log(median)