Javascript - 模拟空格键按键 [英] Javascript - Emulate a space bar keypress

问题描述

我到处搜索，阅读MDN上的文档，但我似乎无法解决这个问题。

I've searched everywhere, read the docs on MDN, but I can't seem to solve this problem.

我想模仿客户端按空格使用Javascript吧。

I want to emulate the client pressing the space bar using Javascript.

我试过：

var e = new KeyboardEvent('keydown');
e.which = e.keyCode = 32; // 32 is the keycode for the space bar
document.dispatchEvent(e);

然而，无论出于何种原因，这都无效;如果在上面的代码之前放置了以下事件处理程序：

However this hasn't worked for whatever reason; if the following event handler is put before the above code:

document.addEventListener('keydown', function(ev){
  console.log(ev.which);
});

0 被记录到控制台。

由于某种原因，事件被触发但关键始终是 0

For some reason, the event is triggered but the key is always 0

有人可以帮我解决吗？

推荐答案

你可以这样做

var e = new KeyboardEvent（'keydown'，{'keyCode'：32，'which'：32}）;

演示： https://jsfiddle.net/5se13tmg/

参考： https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/KeyboardEvent

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