js 实现存储Map 结构的数据

<script type="text/javascript">
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;
}
</script>

====================================

<script type="text/javascript">
var map=new Map();
map.put('h','hello');
map.put('hw','world');
console.log(map);
</script>

====================================