如何处理ArrowKeys和< （大于）在Javascript函数？哪个事件和哪个代码（charCode或keyCode）？ [英] How can I handle ArrowKeys and < (Greater Than) in a Javascript function? Which event and which code (charCode Or keyCode)?
问题描述
如何在Javascript函数中处理ArrowKeys和< （大于）？哪个事件和哪个代码（charCode或keyCode）？
How can I handle ArrowKeys and < (Greater Than) in a Javascript function? Which event and which code (charCode Or keyCode)?
我很困惑如何做到这一点。我仔细阅读了这个链接，
活动和keyCode + charCode ，但是我找不到任何解决方案。
I am very confused how to do this. I have read this link very carefully, Events and keyCode+charCode, but I could not find any solution for my scenario.
推荐答案
使用 event.keyCode 就足够了您只需要考虑到关键事件的浏览器兼容性问题。
Using event.keyCode is sufficient. You only need to browser compatibility issues with regard to obtaining the key event into account.
这是一个基本的开始示例，它捕获箭头键，copy'n'paste'n'运行它：
Here's a basic kickoff example which captures arrow keys, copy'n'paste'n'run it:
<!DOCTYPE html>
<html lang="en">
<head>
<title>SO question 3181648</title>
<script>
document.onkeydown = function(e) {
e = e || event; // "real browsers" || IE6/7.
switch (e.keyCode) {
case 37: alert('left'); break;
case 38: alert('up'); break;
case 39: alert('right'); break;
case 40: alert('down'); break;
}
}
</script>
</head>
<body>
<p>Press one of the arrow keys.</p>
</body>
</html>
Note that attaching events is better to be done this way or using jQuery.
为了捕获像< 这样按下的字符， a href =http：//＃3182548 =noreferrer> Tim的答案。
For capturing the pressed characters like <, have a look at Tim's answer.
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