HTML

<a href="demoLink" id="myLink"> myLink </a>
<button onclick="fireLink(event)"> Call My Link </button>

JS

// click event listener of the link element --------------  
document.getElementById('myLink').addEventListener("click", callLink);
function callLink(e) {
    // code to fire
}

// function invoked by the button element ----------------
function fireLink(event) {                   
    document.getElementById('myLink').click();      // script calls the "click" event of the link element 
}

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");

只是建议一个不需要手动调用监听器事件的替代方案:

无论您的事件侦听器做什么，都要将其移动到一个函数中，并从事件侦听器调用该函数。

然后，您还可以在需要完成与事件触发时相同的事情的其他任何地方调用该函数。

我发现这种方法不那么“代码密集”，也更容易阅读。

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。

你想要的是这样的:

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

使用jQuery，它是这样的:

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

你可以使用下面的代码来使用Element方法触发事件:

if (!Element.prototype.triggerEvent) {
    Element.prototype.triggerEvent = function (eventName) {
        var event;

        if (document.createEvent) {
            event = document.createEvent("HTMLEvents");
            event.initEvent(eventName, true, true);
        } else {
            event = document.createEventObject();
            event.eventType = eventName;
        }

        event.eventName = eventName;

        if (document.createEvent) {
            this.dispatchEvent(event);
        } else {
            this.fireEvent("on" + event.eventType, event);
        }
    };
}

if (!Element.prototype.triggerEvent) { Element.prototype.triggerEvent = function (eventName) { var event; if (document.createEvent) { event = document.createEvent("HTMLEvents"); event.initEvent(eventName, true, true); } else { event = document.createEventObject(); event.eventType = eventName; } event.eventName = eventName; if (document.createEvent) { this.dispatchEvent(event); } else { this.fireEvent("on" + event.eventType, event); } }; } var input = document.getElementById("my_input"); var button = document.getElementById("my_button"); input.addEventListener('change', function (e) { alert('change event fired'); }); button.addEventListener('click', function (e) { input.value = "Bye World"; input.triggerEvent("change"); }); <input id="my_input" type="input" value="Hellow World"> <button id="my_button">Change Input</button>