js map

 // js通用方法

 // map对象定义
 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;
 }