Question

我从用户B1KMusic找到了这个解决方案：JavaScript multiple keys pressed at once

代码：

map={}//I know most use an array, but the use of string indexes in arrays is questionable
onkeydown=onkeyup=function(e){
    e=e||event//to deal with IE
    map[e.keyCode]=e.type=='keydown'?true:false
    /*insert conditional here*/
}

if(map[17]&&map[16]&&map[65]){//CTRL+SHIFT+A
    alert('Control Shift A')
}else if(map[17]&&map[16]&&map[66]){//CTRL+SHIFT+B
    alert('Control Shift B')
}else if(map[17]&&map[16]&&map[67]){//CTRL+SHIFT+C
    alert('Control Shift C')
}

这有效，但我遇到了问题：按下CTRL + SHIFT + B后收到警报后，按任意键，我再次收到警报。

B1KMusic发现了这个工作：

 if(map[17]&&map[16]&&map[65]){//CTRL+SHIFT+A
    alert('Oh noes, a bug!')
}
//When you Press any key after executing this, it will alert again, even though you 
//are clearly NOT pressing CTRL+SHIFT+A
//The fix would look like this:

 if(map[17]&&map[16]&&map[65]){//CTRL+SHIFT+A
    alert('Take that, bug!')
    map={}
}
//The bug no longer happens since the map object is cleared

我试过了，问题仍然存在。

使用JavaScript KeyCode - 一次按下多个键

0 个答案: