【冷知识】获取网页所有的监听事件类型、方法。请认准getEventListeners

  获取事件列表

getEventListeners(window)//获取window绑定的所有监听事件列表

//----------------------------------------

getEventListeners(document.querySelector("选择器"))//获取指定DOM的所有监听事件列表

这里以CSDN为例，F12当前页面在Console选项卡输入 getEventListeners(window),回车执行代码后会输出以下对象：

{
    "load": [
        {"useCapture": false, "passive": false, "once": false, "type": "load"},
        {"useCapture": false, "passive": false, "once": false, "type": "load"},
        {"useCapture": false, "passive": false, "once": false, "type": "load"},
        {"useCapture": false, "passive": false, "once": false, "type": "load"},
        {"useCapture": false, "passive": false, "once": false, "type": "load"}
    ],
    "unload": [
        {"useCapture": false, "passive": false, "once": false, "type": "unload"},
        {"useCapture": false, "passive": false, "once": false, "type": "unload"},
        {"useCapture": false, "passive": false, "once": false, "type": "unload"},
        {"useCapture": false, "passive": false, "once": false, "type": "unload"},
        {"useCapture": false, "passive": false, "once": false, "type": "unload"}
    ],
    "beforeunload": [
        {"useCapture": false, "passive": false, "once": false, "type": "beforeunload"}
    ],
    "pagehide": [
        {"useCapture": false, "passive": false, "once": false, "type": "pagehide"},
        {"useCapture": false, "passive": false, "once": false, "type": "pagehide"}
    ],
    "error": [
        {"useCapture": false, "passive": false, "once": false, "type": "error"}
    ],
    "keydown": [
        {"useCapture": false, "passive": false, "once": false, "type": "keydown"}
    ],
    "resize": [
        {"useCapture": false, "passive": false, "once": false, "type": "resize"},
        {"useCapture": false, "passive": false, "once": false, "type": "resize"},
        {"useCapture": false, "passive": false, "once": false, "type": "resize"},
        {"useCapture": false, "passive": false, "once": false, "type": "resize"}
    ],
    "scroll": [
        {"useCapture": false, "passive": false, "once": false, "type": "scroll"},
        {"useCapture": false, "passive": false, "once": false, "type": "scroll"},
        {"useCapture": false, "passive": false, "once": false, "type": "scroll"},
        {"useCapture": false, "passive": false, "once": false, "type": "scroll"}
    ],
    "orientationchange": [
        {"useCapture": false, "passive": false, "once": false, "type": "orientationchange"}
    ],
    "pageshow": [
        {"useCapture": false, "passive": false, "once": false, "type": "pageshow"}
    ],
    "focus": [
        {"useCapture": false, "passive": false, "once": false, "type": "focus"}
    ],
    "blur": [
        {"useCapture": false, "passive": false, "once": false, "type": "blur"}
    ],
    "DOMContentLoaded": [
        {"useCapture": false, "passive": false, "once": false, "type": "DOMContentLoaded"},
        {"useCapture": false, "passive": false, "once": false, "type": "DOMContentLoaded"},
        {"useCapture": false, "passive": false, "once": false, "type": "DOMContentLoaded"}
    ],
    "keyup": [
        {"useCapture": false, "passive": false, "once": false, "type": "keyup"}]
};

获取事件绑定的方法源码

getEventListeners(window).事件名[0].listener;

//----------------------------------------

getEventListeners(document.querySelector("选择器")).事件名[0].listener;

触发事件绑定的方法

getEventListeners(window).事件名[0].listener();

//----------------------------------------

getEventListeners(document.querySelector("选择器")).事件名[0].listener();

移除对应绑定的事件监听（尤其是某些页面禁止了复制、切屏的时候屡试不爽，你懂得[坏笑]）

var event=getEventListeners(window).事件名[0];
window.removeEventListener(event.type,event.listener);

//----------------------------------------

var dom=document.querySelector("选择器");
var event=getEventListeners(dom).事件名[0];
dom.removeEventListener(event.type,event.listener);

批量移除所有监听事件（硬核！）

var events=getEventListeners(window)
for (var eventName in events) {var eventItems = events[eventName];
    console.log(event);
    for (var i = 0, l = eventItems.length; i < l; i++) {
        var eventItem = eventItems[i];
        window.removeEventListener(eventItem.type,eventItem.listener);
    }
}

//----------------------------------------

var dom=document.querySelector("选择器")
var events=getEventListeners(dom)
for (var eventName in events) {var eventItems = events[eventName];
    console.log(event);
    for (var i = 0, l = eventItems.length; i < l; i++) {
        var eventItem = eventItems[i];
        dom.removeEventListener(eventItem.type,eventItem.listener);
    }
}

批量移除并打印指定DOM及其子元素所有监听方法代码（实用！）

var getAllEvents = function (sel) {
    var doms = [document.querySelector(sel)].concat([].slice.call(document.querySelectorAll(sel + " *")));//包括元素自己
    for (var i = 0, l = doms.length; i < l; i++) {
        var dom = doms[i];
        var events = getEventListeners(dom);
        for (var eventName in events) {
            var eventItems = events[eventName];
            for (var j = 0, len = eventItems.length; j < len; j++) {
                var eventItem = eventItems[j];
                dom.removeEventListener(eventItem.type, eventItem.listener);//移除事件
                console.log(`事件[${eventItem.type}]监听方法`, eventItem.listener);
            }
        }
    }
};
getAllEvents(".className");

打印效果