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);

一个非jquery版本，工作在webkit和gecko:

var keyboardEvent = document.createEvent('KeyboardEvent'); var initMethod = typeof keyboardEvent.initKeyboardEvent !== 'undefined' ? 'initKeyboardEvent' : 'initKeyEvent'; keyboardEvent[initMethod]( 'keydown', // event type: keydown, keyup, keypress true, // bubbles true, // cancelable window, // view: should be window false, // ctrlKey false, // altKey false, // shiftKey false, // metaKey 40, // keyCode: unsigned long - the virtual key code, else 0 0, // charCode: unsigned long - the Unicode character associated with the depressed key, else 0 ); document.dispatchEvent(keyboardEvent);

在alex2k8的基础上，这里有一个修订版，可以在jQuery支持的所有浏览器中工作(问题是缺少jQuery.event的参数。触发器，在使用内部函数时很容易忘记它)。

// jQuery plugin. Called on a jQuery object, not directly.
jQuery.fn.simulateKeyPress = function (character) {
  // Internally calls jQuery.event.trigger with arguments (Event, data, elem).
  // That last argument, 'elem', is very important!
  jQuery(this).trigger({ type: 'keypress', which: character.charCodeAt(0) });
};

jQuery(function ($) {
  // Bind event handler
  $('body').keypress(function (e) {
    alert(String.fromCharCode(e.which));
    console.log(e);
  });
  // Simulate the key press
  $('body').simulateKeyPress('x');
});

您甚至可以更进一步，让它不仅模拟事件，而且实际插入字符(如果它是一个输入元素)，但是在尝试这样做时，有许多跨浏览器的问题。最好使用更精致的插件，如SendKeys。

这就是我在chrome中使用js/typescript所做的尝试。多亏了 这是灵感的答案。

var x = document.querySelector('input');

var keyboardEvent = new KeyboardEvent("keypress", { bubbles: true });
// you can try charCode or keyCode but they are deprecated
Object.defineProperty(keyboardEvent, "key", {
  get() {
    return "Enter";
  },
});
x.dispatchEvent(keyboardEvent);

{ // example document.querySelector('input').addEventListener("keypress", e => console.log("keypress", e.key)) // unfortunatelly doesn't trigger submit document.querySelector('form').addEventListener("submit", e => { e.preventDefault(); console.log("submit") }) } var x = document.querySelector('input'); var keyboardEvent = new KeyboardEvent("keypress", { bubbles: true }); // you can try charCode or keyCode but they are deprecated Object.defineProperty(keyboardEvent, "key", { get() { return "Enter"; }, }); x.dispatchEvent(keyboardEvent); <form> <input> </form>

本地JavaScript与TypeScript支持的解决方案:

键入keyCode或您正在使用的任何属性，并将其转换为KeyboardEventInit

例子

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

你可以用下面的代码模拟输入密码:

铬测试100%工作

DoCustomEvent('password', '#loginpin');



function DoCustomEvent(ct, elem){
var key;
var pressEvent = document.createEvent("CustomEvent");
pressEvent.initCustomEvent("keypress", true, false);

for (var i =0; i < ct.length; ++i)
{
    key                     = ct.charCodeAt(i);
    pressEvent.bubbles      = true;
    pressEvent.cancelBubble = false;
    pressEvent.returnValue  = true;
    pressEvent.key          = ct.charAt(i);
    pressEvent.keyCode      = key;
    pressEvent.which        = key;
    pressEvent.charCode     = key;
    pressEvent.shiftKey     = false;
    pressEvent.ctrlKey      = false;
    pressEvent.metaKey      = false;

    document.querySelector(elem).focus();

    //keypress //beforeinput //input //sendkeys //select
    setTimeout(function() {
        var e = new window.KeyboardEvent('keypress', pressEvent);
        document.activeElement.dispatchEvent(e);
        e = new window.KeyboardEvent('input', pressEvent);
        document.activeElement.dispatchEvent(e);

    }, 0);

    document.querySelector(elem).value = document.querySelector(elem).value + ct.charAt(i);
}