I wrote a map in js with traversal function, please comment.
//map.js
Array.prototype.remove = function(s) { for (var i = 0; i < this.length; i++) { if (s == this[i]) this.splice(i, 1); } } /** * Simple Map * * * var m = new Map(); * m.put('key','value'); * ... * var s = ""; * m.each(function(key,value,index){ * s += index+":"+ key+"="+value+"/n"; * }); * alert(s); * * @author dewitt * @date 2008-05-24 */function Map() { /** Array for storing the keys (used for traversal) */ this.keys = new Array(); /** Store data*/ this.data = new Object(); /** * Put a key-value pair* @param {String} key * @param {Object} value */ this.put = function(key, value) { if(this.data[key] == null){ this.keys.push(key); } this.data[key] = value; }; /** * Get the value corresponding to a key* @param {String} key * @return {Object} value */ this.get = function(key) { return this.data[key]; }; /** * Delete a key-value pair* @param {String} key */ this.remove = function(key) { this.keys.remove(key); this.data[key] = null; }; /** * Traversing the Map and executing the processing function* * @param {Function} Callback function function(key,value,index){..} */ this.each = function(fn){ if(typeof fn != 'function'){ return; } var len = this.keys.length; for(var i=0;i<len;i++){ var k = this.keys[i]; fn(k,this.data[k],i); } }; /** * Get a key-value array (similar to Java's entrySet()) * @return Array of key-value object {key,value}*/ this.entrys = function() { var len = this.keys.length; var entrys = new Array(len); for (var i = 0; i < len; i++) { entrys[i] = { key : this.keys[i], value : this.data[i] }; } return entrys; }; /** * Determine whether the Map is empty*/ this.isEmpty = function() { return this.keys.length == 0; }; /** * Get the number of key-value pairs*/ this.size = function(){ return this.keys.length; }; /** * Rewrite toString */ this.toString = function(){ var s = "{"; for(var i=0;i<this.keys.length; i++,s+=','){ var k = this.keys[i]; s += k+"="+this.data[k]; } s+="}"; return s; }; } function testMap(){ var m = new Map(); m.put('key1','Comtop'); m.put('key2','Southern Power Grid'); m.put('key3','Jingxin Garden'); alert("init:"+m); m.put('key1','Kantop'); alert("set key1:"+m); m.remove("key2"); alert("remove key2: "+m); var s =""; m.each(function(key,value,index){ s += index+":"+ key+"="+value+"/n"; }); alert(s); } //testMap.htm?<html> <head> <title>Test Map</title> <script language="javascript" src="map.js"> </script> </head> <body> <input type="button" value="test" onclick="testMap()"> </body> </html>The above article is a simple JavaScript Map example (sharing) which is all the content I share with you. I hope you can give you a reference and I hope you can support Wulin.com more.