JS组合按键事件监听插件

<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>