你可以通过:EventTarget.dispatchEvent(event)和传入一个新的KeyboardEvent作为事件来实现这一点。

例如:element。dispatchEvent(new KeyboardEvent('keypress'， {'key': 'a'}))

工作的例子:

// get the element in question const input = document.getElementsByTagName("input")[0]; // focus on the input element input.focus(); // add event listeners to the input element input.addEventListener('keypress', (event) => { console.log("You have pressed key: ", event.key); }); input.addEventListener('keydown', (event) => { console.log(`key: ${event.key} has been pressed down`); }); input.addEventListener('keyup', (event) => { console.log(`key: ${event.key} has been released`); }); // dispatch keyboard events input.dispatchEvent(new KeyboardEvent('keypress', {'key':'h'})); input.dispatchEvent(new KeyboardEvent('keydown', {'key':'e'})); input.dispatchEvent(new KeyboardEvent('keyup', {'key':'y'})); <input type="text" placeholder="foo" />

MDN dispatchEvent

MDN KeyboardEvent

你可以调度事件

el.dispatchEvent(new Event('focus'));
el.dispatchEvent(new KeyboardEvent('keypress',{'key':'a'}));

你可以通过直接调用来触发任何事件，就像这样:

$(function() {
    $('item').keydown();
    $('item').keypress();
    $('item').keyup();
    $('item').blur();
});

这是你想做的吗?

你可能还应该触发.focus()和潜在的.change()

如果你想用特定的键触发键事件，你可以这样做:

$(function() {
    var e = $.Event('keypress');
    e.which = 65; // Character 'A'
    $('item').trigger(e);
});

这里有一些关于按键事件的有趣讨论:jQuery事件按键:哪个键被按下了?，特别是关于.which属性的跨浏览器兼容性。

将typescript转换为KeyboardEventInit并提供正确的keyCode整数

const event = new KeyboardEvent("keydown", {
          keyCode: 38,
        } as KeyboardEventInit);

你可以通过:EventTarget.dispatchEvent(event)和传入一个新的KeyboardEvent作为事件来实现这一点。

例如:element。dispatchEvent(new KeyboardEvent('keypress'， {'key': 'a'}))

工作的例子:

// get the element in question const input = document.getElementsByTagName("input")[0]; // focus on the input element input.focus(); // add event listeners to the input element input.addEventListener('keypress', (event) => { console.log("You have pressed key: ", event.key); }); input.addEventListener('keydown', (event) => { console.log(`key: ${event.key} has been pressed down`); }); input.addEventListener('keyup', (event) => { console.log(`key: ${event.key} has been released`); }); // dispatch keyboard events input.dispatchEvent(new KeyboardEvent('keypress', {'key':'h'})); input.dispatchEvent(new KeyboardEvent('keydown', {'key':'e'})); input.dispatchEvent(new KeyboardEvent('keyup', {'key':'y'})); <input type="text" placeholder="foo" />

MDN dispatchEvent

MDN KeyboardEvent

你现在可以做:

var e = $.Event("keydown", {keyCode: 64});