javascript 组合按键事件监听实现代码
JS组合按键事件监听，支持同时监听多组按键如{a,b,c,}{ctrl,c}。
实例代码：
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(){ //<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>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,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();
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