js 构建map 和list

//构建map
function Map() {
    this.arr = new Array();
    var struct = function(key, value) {
            this.key = key;
            this.value = value;
    };
    this.keySet = function() {
        var arrKeys = new Array();
        for(var i = 0; i < this.arr.length; i++) {
            arrKeys.push(this.arr[i].key);
        }
        return arrKeys;
    };
    this.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);
    };
    this.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;
     };
     this.values=function(){
        var value=[]
       for (var i = 0; i < this.arr.length; i++) {
          value.push(this.arr[i].value);
       }
       return value.join(",");
     };
     this.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);
      }
     };
     this.size = function() {
      return this.arr.length;
     };
     this.isEmpty = function() {
         return this.arr.length <= 0;
     };
} 

/**
 * js实现list
 *
 */
function List() {
    this.value = [];  

    /* 添加 */
    this.add = function(obj) {
        return this.value.push(obj);
    };  

    /* 大小 */
    this.size = function() {
        return this.value.length;
    };  

    /* 返回指定索引的值 */
    this.get = function(index) {
        return this.value[index];
    }
    /*返回指定对象的索引
     */
    this.indexOf = function(obj) {
        for ( var i in this.value) { 

            if (obj == this.value[i]) {
                return i;
            }
        }
    };
    /* 删除指定索引的值 */
    this.remove = function(index) {
        this.value.splice(index,1);
        return this.value;
    };  

    /* 删除全部值 */
    this.removeAll = function() {
        return this.value = [];
    };  

    /* 是否包含某个对象 */
    this.constains = function(obj) {
        for ( var i in this.value) {
            if (obj == this.value[i]) {
                return true;
            } else {
                continue;
            }
        }
        return false;
    };  

    /* 是否包含某个对象 */
    this.getAll = function() {
        var allInfos = ‘‘;
        for ( var i in this.value) {
            if(i != (value.length-1)){
                allInfos += this.value[i]+",";
            }else{
                allInfos += this.value[i];
            }
        }
        alert(allInfos);
        return allInfos += this.value[i]+",";;
    };  

}