我使用JavaScript搜索了鼠标悬停时的触发点击，鼠标下拉和鼠标上拉事件。我找到了胡安·门德斯提供的答案。点击这里获取答案。

点击这里是现场演示，下面是代码:

function fireEvent(node, eventName) {
    // Make sure we use the ownerDocument from the provided node to avoid cross-window problems
    var doc;
    if (node.ownerDocument) {
        doc = node.ownerDocument;
    } else if (node.nodeType == 9) {
        // the node may be the document itself, nodeType 9 = DOCUMENT_NODE
        doc = node;
    } else {
        throw new Error("Invalid node passed to fireEvent: " + node.id);
    }

    if (node.dispatchEvent) {
        // Gecko-style approach (now the standard) takes more work
        var eventClass = "";

        // Different events have different event classes.
        // If this switch statement can't map an eventName to an eventClass,
        // the event firing is going to fail.
        switch (eventName) {
        case "click": // Dispatching of 'click' appears to not work correctly in Safari. Use 'mousedown' or 'mouseup' instead.
        case "mousedown":
        case "mouseup":
            eventClass = "MouseEvents";
            break;

        case "focus":
        case "change":
        case "blur":
        case "select":
            eventClass = "HTMLEvents";
            break;

        default:
            throw "fireEvent: Couldn't find an event class for event '" + eventName + "'.";
            break;
        }
        var event = doc.createEvent(eventClass);

        var bubbles = eventName == "change" ? false : true;
        event.initEvent(eventName, bubbles, true); // All events created as bubbling and cancelable.

        event.synthetic = true; // allow detection of synthetic events
        // The second parameter says go ahead with the default action
        node.dispatchEvent(event, true);
    } else if (node.fireEvent) {
        // IE-old school style
        var event = doc.createEventObject();
        event.synthetic = true; // allow detection of synthetic events
        node.fireEvent("on" + eventName, event);
    }
};

注意:initCustomEvent方法现在已弃用。其他回答功能最新的和建议的做法。

如果您支持IE9+，您可以使用以下。在《你可能不需要jQuery》中也包含了同样的概念。

function addEventListener(el, eventName, handler) { if (el.addEventListener) { el.addEventListener(eventName, handler); } else { el.attachEvent('on' + eventName, function() { handler.call(el); }); } } function triggerEvent(el, eventName, options) { var event; if (window.CustomEvent) { event = new CustomEvent(eventName, options); } else { event = document.createEvent('CustomEvent'); event.initCustomEvent(eventName, true, true, options); } el.dispatchEvent(event); } // Add an event listener. addEventListener(document, 'customChangeEvent', function(e) { document.body.innerHTML = e.detail; }); // Trigger the event. triggerEvent(document, 'customChangeEvent', { detail: 'Display on trigger...' });

如果您已经在使用jQuery，下面是上面代码的jQuery版本。

$(函数(){ //添加事件监听器 美元(文档)。on('customChangeEvent'，函数(e, opts) { $('体'). html (opts.detail); })； //触发事件 美元(文档)。触发(customChangeEvent, { detail: '显示在触发器…' })； })； < script src = " https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js " > < /脚本>

你可以使用我一起编译的这个函数。

if (!Element.prototype.trigger)
  {
    Element.prototype.trigger = function(event)
    {
        var ev;

        try
        {
            if (this.dispatchEvent && CustomEvent)
            {
                ev = new CustomEvent(event, {detail : event + ' fired!'});
                this.dispatchEvent(ev);
            }
            else
            {
                throw "CustomEvent Not supported";
            }
        }
        catch(e)
        {
            if (document.createEvent)
            {
                ev = document.createEvent('HTMLEvents');
                ev.initEvent(event, true, true);

                this.dispatchEvent(event);
            }
            else
            {
                ev = document.createEventObject();
                ev.eventType = event;
                this.fireEvent('on'+event.eventType, event);
            }
        }
    }
  }

触发以下事件:

var dest = document.querySelector('#mapbox-directions-destination-input');
dest.trigger('focus');

观察事件:

dest.addEventListener('focus', function(e){
   console.log(e);
});

希望这能有所帮助!

注意:initEvent方法现在已弃用。其他回答功能最新的和建议的做法。

你可以在ie8或更低版本上使用fireEvent，在大多数其他浏览器上使用W3C的dispatchEvent。要创建想要触发的事件，可以根据浏览器使用createEvent或createEventObject。

下面是一段不言自明的代码(来自原型)，它可以触发元素上可用的事件数据:

var event; // The custom event that will be created
if(document.createEvent){
    event = document.createEvent("HTMLEvents");
    event.initEvent("dataavailable", true, true);
    event.eventName = "dataavailable";
    element.dispatchEvent(event);
} else {
    event = document.createEventObject();
    event.eventName = "dataavailable";
    event.eventType = "dataavailable";
    element.fireEvent("on" + event.eventType, event);
}

使用jquery事件调用。 写下面的行，你想触发任何元素的onChange。

$("#element_id").change();

element_id是要触发其onChange的元素的ID。

避免使用

 element.fireEvent("onchange");

因为它的支撑力非常小。请参阅本文档以获得其支持。

一个工作的例子:

// Add an event listener
document.addEventListener("name-of-event", function(e) {
  console.log(e.detail); // Prints "Example of an event"
});

// Create the event
var event = new CustomEvent("name-of-event", { "detail": "Example of an event" });

// Dispatch/Trigger/Fire the event
document.dispatchEvent(event);

对于较旧的浏览器填充和更复杂的示例，请参阅MDN文档。

请参阅EventTarget的支持表。dispatchEvent和CustomEvent。