Detailed introduction of JS key combination event listening plug-in

<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 = {
	    	&#39;version&#39;:&#39;1.0.0&#39;,    //版本号
	    	&#39;author&#39;:&#39;lidequan&#39;,  //作者
	    	&#39;rightKeys&#39;:{},      //监听的按键{key:code},code为按键对应的ascii码 
	    	&#39;curKeys&#39;:[],        //当前按下的键
	    	&#39;sucFuc&#39;:null,       //完成按键的回调函数
	    	&#39;cancelFuc&#39;:null,    //完成按键取消后的回调函数
	    	&#39;isFinsh&#39;:false,    //判断是否完成按键
	    	&#39;isOrder&#39;: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(&#39;keydown&#39;, 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(&#39;keyup&#39;, 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(&#39;on&#39; + ev, fn);  
			    }else{   
			        document.addEventListener(ev,fn,bool);  
			    }  
			}

	    }
	    dqKeys.fn.init.prototype = dqKeys.fn;
   		window.dqKeys = window.$$= dqKeys;
	  })();

    //1.测试
	dqKeys({&#39;a&#39;:65,&#39;b&#39;:66},true,function(){
									console.log(&#39;okey&#39;);
								},function(){
									console.log(&#39;cancel&#39;);
								}).listenkeys();

	//2.测试
	var dqKeys=new $$({&#39;c&#39;:67,&#39;d&#39;:68},false,function(){
									console.log(&#39;keys down &#39;);
								},function(){
									console.log(&#39;keys cancel&#39;);
								});
	dqKeys.listenkeys();
	</script>