/**
*
* 描述：js實現的map方法
* @returns {Map}
*/
function Map(){
var struct = function(key, value) {
this.key = key;
this.value = value;
};
// 添加map鍵值對
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);
};
// 根據key獲取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;
};
// 根據key刪除
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);
}
};
// 獲取map鍵值對個數
var size = function() {
return this.arr.length;
};
// 判斷map是否為空
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 type="text/javascript">
var map=new Map();
map.put("num",1);
map.put("ss","wss");
alert(map.size());
alert(map.get("num"));
paraArr.remove("num");
alert(map.size());
alert(map.get("num"));
</script>