CTRL keyCode（17）无法在JavaScript中运行？ [英] CTRL keyCode (17) not working in JavaScript?

问题描述

我有以下代码，它将eventListener添加到HTML textarea。它应该控制日志按下的键码，如果keyCode是==到17（CTRL），控制台日志你按下了CTRL。。出于某种原因，当我在textarea中按CTRL时，它不是控制台记录按下的keyCode，也不是你按下了CTRL。如果我按A例如，控制台日志返回97这是正确的。它也适用于所有其他字母。

I have the following code which adds an eventListener to a HTML textarea. It's supposed to console log the keycode which was pressed, and, if the keyCode is == to 17 (CTRL), console log "You pressed CTRL.". For some reason, when I press CTRL in the textarea, it's not console logging the keyCode which was pressed, nor "You pressed CTRL." If I press "A" for example, console log return "97" which is correct. It also works with all other letters.

以下是代码：

document.getElementById("msgBox").addEventListener("keypress",function(e){
    console.log(e.keyCode);
    if(e.keyCode == 17){
        console.log("You pressed CTRL.");
    }
});

我做错了什么？

更新：它也没有使用其他特殊键，如shift，Fx，alt，home等。

UPDATE : It's also not working with other special keys like "shift, Fx, alt, home etc.

textarea的HTML：

HTML for the textarea :

<textarea id="msgBox" placeholder="Enter your message" autofocus></textarea>

推荐答案

出于某种原因，特殊键不适用于 keypress 事件，但他们使用 keydown 事件。

For some reason, special keys do not work with the keypress event, but they do with the keydown event.

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