javascript 按住箭头键时的Javascript？
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Javascript when holding down arrow keys?
提问by Trevor Rudolph
I have this script to trigger some javascript. But the script does not support holding down the arrow keys. How can I make this work when I hold the arrow keys.
我有这个脚本来触发一些 javascript。但该脚本不支持按住箭头键。当我按住箭头键时，我怎样才能做到这一点。
document.onkeyup = KeyCheck;
function KeyCheck()
{
var KeyID = event.keyCode;
switch(KeyID)
{
case 37:
right('img'); document.getElementById('img').src = 'guyl.png';
break;
case 38:
up('img');
break
case 39:
left('img'); document.getElementById('img').src = 'guyr.png';
break;
case 40:
down('img');
break;
}
}
回答by Raptor
should be:
应该：
document.onkeydown = KeyCheck;
onkeypress : invokes JavaScript code when a key is pressed
onkeypress : 当一个键被按下时调用 JavaScript 代码
onkeydown : invokes JavaScript code when a key is held down (but not yet released)
onkeydown ：当一个键被按下（但尚未释放）时调用 JavaScript 代码
onkeyup : invokes JavaScript code when a key is has been released after being pressed.
onkeyup ：当按键被按下后释放时调用 JavaScript 代码。
回答by SLaks
You just need to handle the onkeydownevent.
你只需要处理onkeydown事件。
回答by stac
correct your function to accept the event arg
function KeyCheck(event) {
var KeyID = event.keyCode;
...
}
if you want to use combination of keys, then use onkeypress event instead, push the keys into array and see if you have desired combination to follow.
更正您的函数以接受事件 arg
功能键检查（事件）{
var KeyID = event.keyCode;
...
}
如果您想使用按键组合，请改用 onkeypress 事件，将按键推入数组并查看您是否需要遵循所需的组合。
