javascript 组合按键事件监听实现代码

<script type="text/javascript"> 
   (function(){ 
    /** 
    *dqKeys v1.0.0 | (c) 2016 www.findme.wang 
    *@params json keys 监听的按键 
    *@params bool isOrder 按键是否有相应的顺序 
    *@params Function sucFuc 完成按键的回调函数 
    *@params Function cancelFuc 完成按键取消后的回调函数 
    *@author lidequan 
    */ 
    var dqKeys = function(keys,isOrder,sucFuc,cancelFuc) { 
      // 函数体 
      return new dqKeys.fn.init(keys,isOrder,sucFuc,cancelFuc); 
    } 
    dqKeys.fn = dqKeys.prototype = { 
      'version':'1.0.0',  //版本号 
      'author':'lidequan', //作者 
      'rightKeys':{},   //监听的按键{key:code},code为按键对应的ascii码  
      'curKeys':[],    //当前按下的键 
      'sucFuc':null,    //完成按键的回调函数 
      'cancelFuc':null,  //完成按键取消后的回调函数 
      'isFinsh':false,  //判断是否完成按键 
      'isOrder':false,  //按键是否有相应的顺序 
      init:function(keys,isOrder,sucFuc,cancelFuc){ 
        this.rightKeys=keys; 
        this.sucFuc=sucFuc; 
        this.cancelFuc=cancelFuc; 
        this.isOrder=isOrder; 
          
        return this; 
      }, 
      listenkeys:function(){//监听用户键盘操作         
        var _self=this; 
        _self.addListener('keydown', function(oEvent){ 
          var oEvent =oEvent || window.event; 
          if(!_self.arrayContain(_self.curKeys,oEvent.keyCode)){ 
            if(_self.isOrder && _self.getNextKey() == oEvent.keyCode){ 
              _self.curKeys.push(oEvent.keyCode); 
            }else if(!_self.isOrder){ 
              _self.curKeys.push(oEvent.keyCode); 
            } 
          } 
          if(_self.checkResult(_self.rightKeys,_self.curKeys)){ 
            if(_self.sucFuc && !_self.isFinsh){ 
              _self.sucFuc(); 
            } 
            _self.isFinsh=true; 
          } 
        }); 
        _self.addListener('keyup', function(oEvent){ 
          var oEvent =oEvent || window.event;          
          if(_self.checkResult(_self.rightKeys,_self.curKeys) && _self.isFinsh){    
            //完成按键,又取消的事件 
            if(_self.cancelFuc){ 
              _self.cancelFuc(); 
            } 
          } 
  
          _self.curKey=_self.remove(_self.curKeys,oEvent.keyCode); 
          _self.isFinsh=false; 
        }); 
      }, 
      arrayContain:function(arr,val){//判断数组中是否包含某个元素 
          return (arr.indexOf(val) == -1) ? false:true; 
      }, 
      checkResult:function(json,arr){ //判断用户是否按下监听的所有按键 
        for(var i in json){ 
           if(arr.indexOf(json[i])==-1){ 
             return false; 
           } 
         } 
        return true; 
      }, 
      remove:function(arr,val) { //从数组中移除某个元素       
        var index = arr.indexOf(val);  
        if (index > -1) {  
          arr.splice(index, 1);  
        }  
        return arr; 
      }, 
      getNextKey:function(){ //获取下一次按键对应的ascii码 
        for(var i in this.rightKeys){ 
          if(this.curKeys.indexOf(this.rightKeys[i])==-1){ 
             return this.rightKeys[i]; 
           } 
        } 
        return null; 
      }, 
      addListener:function(ev,fn,bool){ //事件绑定 
        if (document.attachEvent) {  
          document.attachEvent('on' + ev, fn);  
        }else{   
          document.addEventListener(ev,fn,bool);  
        }  
      } 
  
    } 
    dqKeys.fn.init.prototype = dqKeys.fn; 
    window.dqKeys = window.$$= dqKeys; 
   })(); 
  
  //1.测试 
  dqKeys({'a':65,'b':66},true,function(){ 
                  console.log('okey'); 
                },function(){ 
                  console.log('cancel'); 
                }).listenkeys(); 
  
  //2.测试 
  var dqKeys=new $$({'c':67,'d':68},false,function(){ 
                  console.log('keys down '); 
                },function(){ 
                  console.log('keys cancel'); 
                }); 
  dqKeys.listenkeys(); 
  </script>