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!

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!

你想要的是这样的:

document.getElementByClassName("example").click();

使用jQuery，它是这样的:

$(".example").trigger("click");

修改@Dorian对IE工作的回答:

document.addEventListener("my_event", function(e) {
  console.log(e.detail);
});

var detail = 'Event fired';

try {

    // For modern browsers except IE:
    var event = new CustomEvent('my_event', {detail:detail});

} catch(err) {

  // If IE 11 (or 10 or 9...?) do it this way:

    // Create the event.
    var event = document.createEvent('Event');
    // Define that the event name is 'build'.
    event.initEvent('my_event', true, true);
    event.detail = detail;

}

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

小提琴:https://jsfiddle.net/z6zom9d0/1/

参见: https://caniuse.com/#feat=customevent

function fireMouseEvent(obj, evtName) {
    if (obj.dispatchEvent) {
        //var event = new Event(evtName);
        var event = document.createEvent("MouseEvents");
        event.initMouseEvent(evtName, true, true, window,
                0, 0, 0, 0, 0, false, false, false, false, 0, null);
        obj.dispatchEvent(event);
    } else if (obj.fireEvent) {
        event = document.createEventObject();
        event.button = 1;
        obj.fireEvent("on" + evtName, event);
        obj.fireEvent(evtName);
    } else {
        obj[evtName]();
    }
}

var obj = document.getElementById("......");
fireMouseEvent(obj, "click");

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);
    }
};