我知道这个问题要求一个javascript的方式来模拟一个按键。但是对于那些正在寻找jQuery方法的人来说:

var e = jQuery.Event("keypress");
e.which = 13 //or e.keyCode = 13 that simulates an <ENTER>
$("#element_id").trigger(e); 

我想模拟按Tab键……扩展Trevor的回答，我们可以看到像“tab”这样的特殊键确实会被按下，但我们看不到按“tab”会产生的实际结果……

尝试与调度这些事件的'activeElement'以及全局文档对象都-代码添加下面;

代码片段如下:

var element = document.getElementById("firstInput"); document.addEventListener("keydown", function(event) { console.log('we got key:', event.key, ' keyCode:', event.keyCode, ' charCode:', event.charCode); /* enter is pressed */ if (event.keyCode == 13) { console.log('enter pressed:', event); theKey = 'Tab'; attributes = { bubbles: true, key: theKey, keyCode: 9, charCode: 0, }; setTimeout(function() { /* event.keyCode = 13; event.target.value += 'b'; */ var e = new window.KeyboardEvent('focus', attributes); document.activeElement.dispatchEvent(e); e = new window.KeyboardEvent('keydown', attributes); document.activeElement.dispatchEvent(e); e = new window.KeyboardEvent('beforeinput', attributes); document.activeElement.dispatchEvent(e); e = new window.KeyboardEvent('keypress', attributes); document.activeElement.dispatchEvent(e); e = new window.KeyboardEvent('input', attributes); document.activeElement.dispatchEvent(e); e = new window.KeyboardEvent('change', attributes); document.activeElement.dispatchEvent(e); e = new window.KeyboardEvent('keyup', attributes); document.activeElement.dispatchEvent(e); }, 4); setTimeout(function() { var e = new window.KeyboardEvent('focus', attributes); document.dispatchEvent(e); e = new window.KeyboardEvent('keydown', attributes); document.dispatchEvent(e); e = new window.KeyboardEvent('beforeinput', attributes); document.dispatchEvent(e); e = new window.KeyboardEvent('keypress', attributes); document.dispatchEvent(e); e = new window.KeyboardEvent('input', attributes); document.dispatchEvent(e); e = new window.KeyboardEvent('change', attributes); document.dispatchEvent(e); e = new window.KeyboardEvent('keyup', attributes); document.dispatchEvent(e); }, 100); } else if (event.keyCode != 0) { console.log('we got a non-enter press...: :', event.key, ' keyCode:', event.keyCode, ' charCode:', event.charCode); } }); <h2>convert each enter to a tab in JavaScript... check console for output</h2> <h3>we dispatchEvents on the activeElement... and the global element as well</h3> <input type='text' id='firstInput' /> <input type='text' id='secondInput' /> <button type="button" onclick="document.getElementById('demo').innerHTML = Date()"> Click me to display Date and Time.</button> <p id="demo"></p>

这种方法支持跨浏览器更改键代码的值。 源

var $textBox = $("#myTextBox");

var press = jQuery.Event("keypress");
press.altGraphKey = false;
press.altKey = false;
press.bubbles = true;
press.cancelBubble = false;
press.cancelable = true;
press.charCode = 13;
press.clipboardData = undefined;
press.ctrlKey = false;
press.currentTarget = $textBox[0];
press.defaultPrevented = false;
press.detail = 0;
press.eventPhase = 2;
press.keyCode = 13;
press.keyIdentifier = "";
press.keyLocation = 0;
press.layerX = 0;
press.layerY = 0;
press.metaKey = false;
press.pageX = 0;
press.pageY = 0;
press.returnValue = true;
press.shiftKey = false;
press.srcElement = $textBox[0];
press.target = $textBox[0];
press.type = "keypress";
press.view = Window;
press.which = 13;

$textBox.trigger(press);

如果你可以使用jQuery 1.3.1:

函数simulateKeyPress(字符){ jQuery.event.trigger ({ 类型:键盘按键, 其中:character.charCodeAt (0) })； ｝ $(函数(){ 美元(的身体).keypress(函数(e) { 警报(e.which); })； simulateKeyPress(“e”); })； < script src = " https://cdnjs.cloudflare.com/ajax/libs/jquery/1.3.1/jquery.min.js " > > < /脚本

这是我找到的:

函数createKeyboardEvent(名称，键，altKey, ctrlKey, shiftKey, metaKey，气泡){ var e = new事件(name) E.key = key e.keyCode = e.key.charCodeAt(0) e.which = e.keyCode e.altKey = altKey e.ctrlKey = ctrlKey e.shiftKey = shiftKey e.metaKey = metaKey e.泡泡=泡泡 返回e ｝ Var name = 'keydown' Var键= 'a' var event = createKeyboardEvent(name, key, false, false, false, false, true) 文档。addEventListener(name， () => {}) document.dispatchEvent(事件)

您可以创建和分派键盘事件，它们将触发相应的已注册事件处理程序，但是，如果分派到input元素，则不会产生任何文本。

要完全模拟文本输入，您需要生成一系列键盘事件，并显式地设置input元素的文本。事件的顺序取决于模拟文本输入的彻底程度。

最简单的形式是:

$('input').val('123');
$('input').change();