大多数浏览器不支持e.key [英] e.key is not supported in most browser

问题描述

在事件监听器中，我使用的是 e.key ，但似乎许多旧版浏览器均不支持它。

In a event listener I am using e.key, but it seems it is not supported by many older browsers.

来自 https://developer.mozilla.org/ zh-CN / docs / Web / API / KeyboardEvent / keyCode 和 https://developer.mozilla.org/zh-CN/docs/Web/API/KeyboardEvent/哪一个我可以看到 e.keyCode 和 e。其中已弃用，而推荐使用 e.key ，因此我想使用 e.key ，但是某些浏览器不支持它怎么办？

From https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode and https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/which I can read that e.keyCode and e.which are deprecated in favor of e.key, so I want to use e.key, but what should I do when some browsers are not supporting it?

我应该使用

const key = e.key || String.fromCharCode(e.keyCode);

例如，如果关键是，它们似乎不会给我相同的结果，

It just seems that they don't give me the same results if the key is, for instance, a comma.

推荐答案

您可以使用所有受支持的方法，首先从首选的 e开始进行检查。键，所有浏览器都会及时支持

You use whichever is supported by checking them all, starting with the preferred e.key which will be supported by all browsers in time

if (e.key) {
     var key = e.key;
} else {
    var code = e.which || e.keyCode;
    var key  = String.fromCharCode(code);
}

他们应该返回相同字符

document.getElementById('test').addEventListener('keypress', function(e) {
    var code = e.which || e.keyCode;
    var key  = String.fromCharCode(code);
    
    console.log(key, e.key)
});

<p>Type in the input !</p>
<input id="test">

请注意，快捷键和 keydown 事件将为某些键返回不同的键码。

Note that keyup and keydown events will return different keycodes for certain keys.

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