javascript 组合按键事件监听实现代码

   (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

    */

    vardqKeys =function(keys,isOrder,sucFuc,cancelFuc) {

      // 函数体

      returnnewdqKeys.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;

        returnthis;

      },

      listenkeys:function(){//监听用户键盘操作        

        var_self=this;

        _self.addListener('keydown',function(oEvent){

          varoEvent =oEvent || window.event;

          if(!_self.arrayContain(_self.curKeys,oEvent.keyCode)){

            if(_self.isOrder && _self.getNextKey() == oEvent.keyCode){

              _self.curKeys.push(oEvent.keyCode);

            }elseif(!_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){

          varoEvent =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(variinjson){

           if(arr.indexOf(json[i])==-1){

             returnfalse;

           }

         }

        returntrue;

      },

      remove:function(arr,val) {//从数组中移除某个元素      

        varindex = arr.indexOf(val); 

        if(index > -1) { 

          arr.splice(index, 1); 

        } 

        returnarr;

      },

      getNextKey:function(){//获取下一次按键对应的ascii码

        for(variinthis.rightKeys){

          if(this.curKeys.indexOf(this.rightKeys[i])==-1){

             returnthis.rightKeys[i];

           }

        }

        returnnull;

      },

      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

  vardqKeys=new$$({'c':67,'d':68},false,function(){

                  console.log('keys down ');

                },function(){

                  console.log('keys cancel');

                });

  dqKeys.listenkeys();