JS数组分页

 1 var Pagination = (function() {
 2     var _default_limit = 1;
 3     var isArray = Array.isArray || function(arr) {
 4         return {}.toString.call(arr) == '[object Array]';
 5     };
 6 
 7     var isInt = function(x) {
 8         var type = typeof x;
 9         return type !== null && (type === 'number');
10     }
11 
12     function _Pagination(list, limit) {
13         if (!(this instanceof Pagination)) {
14             return new Pagination(list, limit || _default_limit);
15         }
16         if (!isArray(list)) throw new Error("list must be array");
17         this.list = list;
18         this.limit = limit;
19         this.total = Math.ceil(list.length / limit);
20         return this;
21     }
22 
23     _Pagination.prototype.page = function(pagenum) {
24         if (!isInt(pagenum)) throw new Error("pagenum must be number");
25         if (pagenum < 1 || pagenum > this.total) {
26             throw new Error("pagenum must be in range[" + 1 + ", " + this.total + "]");
27         }
28         var start = this.limit * (pagenum - 1);
29         return this.list.slice(start, start + this.limit);
30     };
31 
32     _Pagination.prototype.toString = function() {
33         var result = [];
34         for (var i = 1; i <= this.total; i++) {
35             result.push("[" + this.page(i).join(',') + "]");
36         }
37         return result.join(',');
38     }
39     return _Pagination;
40 
41 })();
42 
43 var pagination = Pagination([1, 32, 43, 4, 15, 6, 7, 8, 9, 10,34],2);
44 console.log(pagination+"")