本文实例讲述了JS模拟的Map类。分享给大家供大家参考，具体如下：
根据java中map的属性，实现key----value保存
1、使用数组方式存储数据，（使用闭包）
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; }
2、使用JSON方式存储数据（使用原型方式拓展方法）
function Map() { this.obj = {}; this.count = 0; } Map.prototype.put = function (key, value) { var oldValue = this.obj[key]; if (oldValue == undefined) { this.count++; } this.obj[key] = value; } Map.prototype.get = function (key) { return this.obj[key]; } Map.prototype.remove = function (key) { var oldValue = this.obj[key]; if (oldValue != undefined) { this.count--; delete this.obj[key]; } } Map.prototype.size = function () { return this.count; } var map = new Map(); map.put("key","map"); map.put("key","map1"); alert(map.get("key"));//map1 map.remove("key"); alert(map.get("key"));//undefined
希望本文所述对大家JavaScript程序设计有所帮助。
【JS模拟的Map类实现方法】相关文章：