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Contoh kod untuk melaksanakan Map dalam kemahiran JavaScript_javascript

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Lepaskan: 2016-05-16 15:39:56
asal
1351 orang telah melayarinya

Tiada lagi perkara karut, cuma hantar kod.

Kod 1:

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var map=new Map();

map.put("a","A");map.put("b","B");map.put("c","C");

map.get("a"); //返回:A

map.entrySet() // 返回Entity[{key,value},{key,value}]

map.containsKey('kevin') //返回:false

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function Map() {

  this.keys = new Array();

  this.data = new Object();

  /**

   * 放入一个键值对

   * @param {String} key

   * @param {Object} value

   */

  this.put = function(key, value) {

    if(this.data[key] == null){

      this.keys.push(key);

      this.data[key] = value;

    }else{

      this.data[key]=this.data[key];

    }

    return true;

  };

  /**

   * 获取某键对应的值

   * @param {String} key

   * @return {Object} value

   */

  this.get = function(key) {

    return this.data[key];

  };

  /**

   * 删除一个键值对

   * @param {String} key

   */

  this.remove = function(key) {

    for(var i=0;i<this.keys.length;i++){

      if(key===this.keys[i]){

        var del_keys= this.keys.splice(i,1);

        for(k in del_keys){

          this.data[k] = null;

        }

        return true;

      }

    }

    return false;

  };

  /**

   * 遍历Map,执行处理函数

   *

   * @param {Function} 回调函数 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);

    }

  };

  /**

   * 获取键值数组

   * @return entity[{key,value},{key,value}]

   */

  this.entrySet = 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[this.keys[i]]

      };

    }

    return entrys;

  };

  /**

   * 判断Map是否为空

   */

  this.isEmpty = function() {

    return this.keys.length == 0;

  };

  /**

   * 获取键值对数量

   */

  this.size = function(){

    return this.keys.length;

  };

  this.containsKey=function(key){

    return this.keys.filter(function(v){

      if(v===key){

        return key;

      }

    }).length>0;

  };

  /**

   * 重写toString

   */

  this.toString = function(){

    var s = "{";

    for(var i=0;i<this.keys.length;i++){

      var k = this.keys[i];

      s += k+"="+this.data[k];

      if(this.keys.length>i+1){

        s+=','

      }

    }

    s+="}";

    return s;

  };

  /**

   * 解析字符串到Map

   * {a=A,b=B,c=B,}

   */

  this.parserStringAndAddMap=function(str){

    var count=0;

    if(str && str.length>0){

      str=str.trim();

      var startIndex=str.indexOf("{"),endIndex=str.lastIndexOf("}");

      if(startIndex!==-1 && endIndex!==-1){

        str=str.substring(startIndex+1,endIndex);

        var arrs= str.split(",");

        for(var i=0;i<arrs.length;i++){

          var kv=arrs[i].trim();

          if(kv.length>0 && kv.indexOf("=")!==-1){

            var kv_arr=kv.split("=");

            if(kv_arr.length==2){

              if(this.put(kv_arr[0].trim(),kv_arr[1].trim())){

                count++;

              }else{

                console.error('error: kv:'+kv);

              }

            }

          }

        }

      }else{

        console.log("data error:"+str);

      }

    }else{

      console.log('data is not empty');

    }

    return count;

  };

}

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Kod 2:

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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() {

  /** 存放键的数组(遍历用到) */

  this.keys = new Array();

  /** 存放数据 */

  this.data = new Object();

  /**

   * 放入一个键值对

   * @param {String} key

   * @param {Object} value

   */

  this.put = function(key, value) {

    if(this.data[key] == null){

      this.keys.push(key);

    }

    this.data[key] = value;

  };

  /**

   * 获取某键对应的值

   * @param {String} key

   * @return {Object} value

   */

  this.get = function(key) {

    return this.data[key];

  };

  /**

   * 删除一个键值对

   * @param {String} key

   */

  this.remove = function(key) {

    this.keys.remove(key);

    this.data[key] = null;

  };

  /**

   * 遍历Map,执行处理函数

   *

   * @param {Function} 回调函数 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);

    }

  };

  /**

   * 获取键值数组(类似Java的entrySet())

   * @return 键值对象{key,value}的数组

   */

  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;

  };

  /**

   * 判断Map是否为空

   */

  this.isEmpty = function() {

    return this.keys.length == 0;

  };

  /**

   * 获取键值对数量

   */

  this.size = function(){

    return this.keys.length;

  };

  /**

   * 重写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;

  };

}

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function testMap(){

  var m = new Map();

  m.put('key1','Comtop');

  m.put('key2','南方电网');

  m.put('key3','景新花园');

  alert("init:"+m);

  m.put('key1','康拓普');

  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);

}

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Kandungan di atas menggunakan dua keping kod untuk berkongsi dengan anda pelaksanaan Peta dalam JavaScript. Saya harap anda menyukainya.

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