在 HTML 元素上执行一次单击：只需执行element.click(). 大多数主要浏览器都支持这一点。

多次重复单击：向元素添加 ID 以唯一选择它：

<a href="#" target="_blank" id="my-link" onclick="javascript:Test('Test');">Google Chrome</a>

并.click()通过 for 循环调用JavaScript 代码中的方法：

var link = document.getElementById('my-link');
for(var i = 0; i < 50; i++)
   link.click();

更新

这是一个旧的答案。现在你应该只使用click。对于更高级的事件触发，请使用dispatchEvent。

const body = document.body;

body.addEventListener('click', e => {
  console.log('clicked body');
});

console.log('Using click()');
body.click();

console.log('Using dispatchEvent');
body.dispatchEvent(new Event('click'));

原答案

这是我使用的：http : //jsfiddle.net/mendesjuan/rHMCy/4/

更新以与 IE9+ 一起使用

/**
 * Fire an event handler to the specified node. Event handlers can detect that the event was fired programatically
 * by testing for a 'synthetic=true' property on the event object
 * @param {HTMLNode} node The node to fire the event handler on.
 * @param {String} eventName The name of the event without the "on" (e.g., "focus")
 */
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);
        event.initEvent(eventName, true, 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, you can drop this if you don't need to support IE8 and lower
        var event = doc.createEventObject();
        event.synthetic = true; // allow detection of synthetic events
        node.fireEvent("on" + eventName, event);
    }
};

请注意，调用fireEvent(inputField, 'change');并不意味着它实际上会更改输入字段。触发更改事件的典型用例是当您以编程方式设置字段并且您希望调用事件处理程序时，因为调用input.value="Something"不会触发更改事件。

什么

 l.onclick();

do 正是调用 的onclick函数l，也就是说，如果您已经设置了l.onclick = myFunction;. 如果你还没有设置l.onclick，它什么都不做。相比之下，

 l.click();

模拟单击并触发所有事件处理程序，无论是使用l.addEventHandler('click', myFunction);、在 HTML 中添加还是以任何其他方式添加。

我很惭愧有这么多不正确或未公开的部分适用性。

最简单的方法是使用控制台通过 Chrome 或 Opera（我的示例将使用 Chrome）。在控制台输入以下代码（一般在1行）：

var l = document.getElementById('testLink');
for(var i=0; i<5; i++){
  l.click();
}

这将生成所需的结果

.click()不适用于 Android（在移动部分查看mozilla 文档）。您可以使用此方法触发点击事件：

function fireClick(node){
    if (document.createEvent) {
        var evt = document.createEvent('MouseEvents');
        evt.initEvent('click', true, false);
        node.dispatchEvent(evt);    
    } else if (document.createEventObject) {
        node.fireEvent('onclick') ; 
    } else if (typeof node.onclick == 'function') {
        node.onclick(); 
    }
}

从这个帖子