Rumah >hujung hadapan web >tutorial js >Javascript melaksanakan kemahiran koleksi_javascript peta
Beberapa hari yang lalu, saya ingin menggunakan peta untuk mengumpul perkara yang sama dalam projek. Saya hanya mengambil objek dan meletakkannya seketika Hari ini saya mempunyai masa lapang untuk melaksanakannya
Jangan ketawa, semua
var Map = function (){ /************基础变量**************/ var hashmap = {}; var keys = []; var vals = []; var entrys = []; var size = 0; var index = {}; var Entry = function(key,value){ var entryKey = key; var entryValue = value; this.getKey = function (){ return entryKey; }; this.getValue = function(){ return entryValue; }; }; /************基本方法 按字母排序**************/ this.clear = function(key) { hashmap[key] = undefined; var i = index[key]; entrys.splice(i,1); vals.splice(i,1); keys.splice(i,1); size --; }; this.entrySet = function() { return entrys; }; this.get = function(key){ return hashmap[key]; }; this.isEmpty = function() { if(hashmap) return true; return false; }; this.keySet = function() { return keys; }; this.put = function(key,value){ if(!this.get(key)){ entrys.push(new Entry(key,value)); keys.push(key); vals.push(value); index[key] = size; size ++; } else { var i = index[key]; entrys[i] = new Entry(key,value); vals[i] = value; } hashmap[key] = value; }; this.size = function() { return size; }; this.values = function() { return vals; }; }; /************扩展方法**************/ Map.prototype = { containsKey : function(key) { if(this.get(key)) return true; return false; }, putAll : function(set) { for(var e in set){ if(set[e]){ this.put(e,set[e]); } } }, remove : function(key) { var v = this.get(key); this.clear(key); return v; } }; var h = new Map(); h.put('a',10); h.put('b',11); h.put('c',3); h.put('d',5); console.info(h.size()); h.clear('a'); console.info(h.containsKey('a')); console.info(h.containsKey('b')); console.info(h.size()); console.log(h.entrySet()); console.log(h.keySet()); console.log(h.values()); for(var i in h.entrySet()){ var obj = h.entrySet()[i]; console.log(obj.getKey() + ":" + obj.getValue()); }