onkeydown和onkeyup事件在Internet Explorer 8上不起作用 [英] onkeydown and onkeyup events don't work on Internet Explorer 8
本文介绍了onkeydown和onkeyup事件在Internet Explorer 8上不起作用的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我的代码在IE9 / IE10,FF,Chrome和Opera上没有问题,但在较旧的Internet Explorer上没有处理键盘输入。
My code works without problems on IE9/IE10, FF, Chrome and opera but on older Internet Explorer no Keyboard input is handled.
我有以下代码:处理事件。它只应在按下新按钮时触发。
I have the following code for handling events. It should only fire when a new button is pressed.
lastEvent = void 0;
heldKeys = {};
window.onkeydown = function(event) {
if (lastEvent && lastEvent.keyCode === event.keyCode) {
return;
}
lastEvent = event;
heldKeys[event.keyCode] = true;
switch (event.which) {
case 80:
return myamp.userInput("positiv");
case 81:
return myamp.userInput("negativ");
}
};
window.onkeyup = function(event) {
lastEvent = null;
return delete heldKeys[event.keyCode];
};
推荐答案
尝试
lastEvent = void 0;
heldKeys = {};
window.onkeydown = function(event) {
event = event || window.event; //IE does not pass the event object
if (lastEvent && lastEvent.keyCode === event.keyCode) {
return;
}
lastEvent = event;
heldKeys[event.keyCode] = true;
var keyCode = event.which || event.keyCode; //key property also different
switch (keyCode) {
case 80:
return myamp.userInput("positiv");
case 81:
return myamp.userInput("negativ");
}
};
window.onkeyup = function(event) {
event = event || window.event;
lastEvent = null;
return delete heldKeys[event.keyCode];
};
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