js Number.prototype 对象 设置一些方法

$(document).ready(initPage);        function initPage() {                var value = (8).iterate();        alert(value);//// [0, 1, 2, 3, 4, 5, 6, 7, 8]        }                      Number.prototype.iterate = function () {          var result = [];          for (var i = 0; i <= this; i++) {            result.push(i);          }          return result;        };

Number.prototype.add = function (x) {  return this + x;};

(8).add(2)// 10