JavaScript实现Java的Map、List功能，如下代码
function?HashMap(){?
????this.size=0;?
????this.map=new?Object();?
}?
?
HashMap.prototype.put=function(key,value){?
????if(!this.map[key]){?
????????this.size++;?
????}?
????this.map[key]=value;?
};?
HashMap.prototype.get=function(key){?
????return?this.isKey(key)?this.map[key]:null;?
};?
HashMap.prototype.isKey=function(key){?
????return?(key?in?this.map);?
};?
HashMap.prototype.remove=function(key){?
??if(?this.isKey(key)?&&?(delete?this.map[key])){???
????????this.size--;???
??}???
};?
?
HashMap.prototype.size=function(){?
????return?this.size;?
};?
?
HashMap.prototype.find=function(_callback){?
????for(var?_key?in?this.map){?
????????_callback.call(this,_key,this.map[_key]);?
????}?
};?
//List?
?
function?ArrayList(){?
????this.size=0;?
????this.list=new?Object();?
};?
ArrayList.prototype.add=function(obj){?
????this.list[this.size++];?
????return?this.size;?
};?
ArrayList.prototype.remove=function(index){?
????if(this.size>index){?
????????delete?this.list[index--];?
????????return?this.size--;?
????}?
????return?-1;?
};?
ArrayList.prototype.size=function(){?
????return?this.size;?
};?
ArrayList.prototype.get=function(index){?
????return?this.size>index?this.list[index]:null;?
};?
ArrayList.prototype.clear=function(){?
????this.list=null;?
};?
ArrayList.prototype.contains=function(obj){?
????return?this.indexOf(obj)>=0?true:false;?
};?
ArrayList.prototype.indexOf=function(obj){?
????for(var?i=0;i<this.size;i++){?
????????if(this.list[i]==obj){?
????????????return?i;?
????????}?
????}?
????return?-1;?
};?
ArrayList.prototype.isEmpty=function(){?
????return?this.size<0?true:false;?
};?
?
?
function?HashSet(){?
????this.size=0;?
????this.set=new?Object();?
};?
HashSet.prototype.add=function(obj){?
????this.indexOf(obj)<0?this.set[this.size++]=obj:null;?
????return?this.size;?
};?
HashSet.prototype.remove=function(index){?
????if(this.size>index){?
????????delete?this.set[index--];?
????????return?this.size--;?
????}?
????return?-1;?
};?
HashSet.prototype.size=function(){?
????return?this.size;?
};?
HashSet.prototype.get=function(index){?
????return?this.size>index?this.set[index]:null;?
};?
HashSet.prototype.clear=function(){?
????this.set=null;?
};?
HashSet.prototype.contains=function(obj){?
????return?this.indexOf(obj)>=0?true:false;?
};?
HashSet.prototype.indexOf=function(obj){?
????for(var?i=0;i<this.size;i++){?
????????if(this.set[i]==obj){?
????????????return?i;?
????????}?
????}?
????return?-1;?
};?
HashSet.prototype.isEmpty=function(){?
????return?this.size<0?true:false;?
};?