js模拟Map对象，实现key---value
根据java中map的属性，实现key----value保存
function Map() {var struct = function (key, value) {this.key = key;this.value = value;}var put = function (key, value) {for (var i = 0; i < this.arr.length; i++) {if (this.arr[i].key === key) {this.arr[i].value = value;return;}}this.arr[this.arr.length] = new struct(key, value);}var get = function (key) {for (var i = 0; i < this.arr.length; i++) {if (this.arr[i].key === key) {return this.arr[i].value;}}return null;}var remove = function (key) {var v;for (var i = 0; i < this.arr.length; i++) {v = this.arr.pop();if (v.key === key) {continue;}this.arr.unshift(v);}}var size = function () {return this.arr.length;}var isEmpty = function () {return this.arr.length <= 0;}this.arr = new Array();this.get = get;this.put = put;this.remove = remove;this.size = size;this.isEmpty = isEmpty;}?
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