Java中的Map是一个很实用的集合,习惯了使用Java中的Map,换别的语言没Map时感觉很不爽,以前写Flex AS代码时碰到过用要用Map的情况,不过AS其实有Dictionary字典类可以代替Java中的Map,同时也可以使用对象的属性-值形式来实现Map,在这里JS的Map实现就是使用的对象的属性-值。实现很简单,这里只是为了让Java程序员轻松的编写JS代码。
//construction function Map() { this.obj = new Object(); }; //add a key-value Map.prototype.put = function(key, value) { this.obj[key] = value; }; //get a value by a key,if don't exist,return undefined Map.prototype.get = function(key) { return this.obj[key]; }; //remove a value by a key Map.prototype.remove = function(key) { if(this.get(key)==undefined) { return; } delete this.obj[key]; }; //clear the map Map.prototype.clear = function() { this.obj = new Object(); }; //get the size Map.prototype.size = function() { var ary = this.keys(); return ary.length; }; //get all keys Map.prototype.keys = function() { var ary = new Array(); for(var temp in this.obj) { ary.push(temp); } return ary; }; //get all values Map.prototype.values = function() { var ary = new Array(); for(var temp in this.obj) { ary.push(this.obj[temp]); } return ary; };