【下班后学js】判断传入的两个数组是否相似

 1          /*
 2          * param1 Array 
 3          * param2 Array
 4          * return true or false
 5          */
 6         function arraysSimilar(arr1, arr2){
 7             if (arr1 instanceof Array){
 8                 return false;
 9             }
10             if (arr2 instanceof Array){
11                 return false;
12             }
13             if (arr1.length !== arr2.length){
14                 return false;
15             }
16             
17             var i = 0,
18                 n = arr1.length,
19                 countMap1 = {},
20                 countMap2 = {},
21                 t1, t2,
22                 TYPES = [‘string‘, ‘boolean‘, ‘number‘, 
23                     ‘undefined‘, ‘null‘, ‘function‘,
24                     ‘data‘, ‘window‘];
25             
26             for (; i < n; i++){
27                 t1 = typeOf(arr1[i]);
28                 t2 = typeOf(arr2[i]);
29                 if (countMap1[t1]){
30                     countMap1[t1]++;
31                 } else {
32                     countMap1[t1] = 1;
33                 }
34                 if (countMap2[t2]){
35                     countMap2[t2]++;
36                 } else {
37                     countMap2[t2] = 1;
38                 }
39             }
40             
41             function typeOf(ele){
42                 var r;
43                 if (ele === null) r = ‘null‘;
44                 else if (ele == window) r = ‘window‘;
45                 else if (ele instanceof Array) r = ‘array‘;
46                 else if (ele instanceof Date) r = ‘date‘;
47                 else r = typeof ele;
48                 return r;
49             }
50             
51             for (i = 0, n = TYPES.length; i < n; i++){
52                 if (countMap1[TYPES[i]] !== countMap2[TYPES[i]]){
53                     return false;
54                 }
55             }
56             
57             return true;
58         }