/** * * 描述:js实现的map方法 * @returns {Map} */ function Map(){ var struct = function(key, value) { this.key = key; this.value = value; }; // 添加map键值对 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); }; // 根据key获取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; }; // 根据key删除 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); } }; // 获取map键值对个数 var size = function() { return this.arr.length; }; // 判断map是否为空 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>
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