一、John Resig 所写的 addEvent() 函数:http://ejohn.org/projects/flexible-javascript-events/ functionaddEvent( obj, type, fn ) { if( obj.attachEvent ) { obj['e'+type+fn]=fn; obj[type+fn]=function(){obj['e'+type+fn]( window.event );} obj.attachEvent('on'+type, obj[type+fn...
var addClass = function(dom, className) { if (!dom) return; if ('length' in dom) { return dom.forEach(function(elem){ addClass(elem, className); }); } if (dom.classList) return dom.classList.add(className); dom.className += ' ' + className; }; var removeClass = function(dom...
事件(event)是用户在访问页面时执行的操作。提交表单和在图像上移动鼠标就是两种事件。当浏览器探测到一个事件时,比如用鼠标单击或按键,它可以触发与这个事件相关联的JavaScript对象,这些对象称为事件处理程序(eventhandler)或者叫做事件侦听器。。 1.设置HTML标签属性为事件处理程序(避免使用) (1)直接将JS代码写在HTM...
function removeEvent(element, event, handler) { if (element.removeEventListener) { element.removeEventListener(event, handler, false); } else if (element.detachEvent) { element.detachEvent('on' + event, handler); } else { element['on' + event] = null; } } 上述函数addEvent和removeEvent...
function addEvent(target, name, fn) { if (target.addEventListener) { target.addEventListener(name, fn, false); } else if (target.attachEvent) { target.attachEvent("on" + name, fn); } else { target["on" + name] = fn; } }
WebComm.getOS() == "MSIE"){obj.releaseCapture ();}else{document.removeEventListener("mousemove",WebComm.MoveDiv,false);}a) function addEvent(el, type, fn){if(el.attachEvent){el['e’+type+fn] = fn;el[type+fn] = function(){el[‘e’+type+fn](window.event);}el....
method enables us to attach an event handler to an element. we can also add multiple event handlers to an element. removeeventlistener() allows us to remove an event listener/handler from a specific element. event object when an event occurs, it belongs to a specific event object. the ...
const em = new EventManager(); em.addEventListner('hello', function() { console.log('hi'); }); em.dispatchEvent('hello'); // hi 这些都比较好理解。下面我们的挑战是: 将以上 20 多行命令式的代码,转换为 7 行 2 个表达式的声明式代码; ...
varEventUtil={addHandler:function(element,type,handler){if(element.addEventListener){// DOM2element.addEventListener(type,handler,false);}elseif(element.attachEvent){// IEelement.attachEvent('on'+type,handler);}else{// DOM0element['on'+type]=handler;}},removeHandler:function(element,type,handler)...
改动很简单,可以使用对应的事件对象作为 handler 的参数,就可以通过event.currentTarget很方便地找到对应点击的按钮了。 译者注:这里的event.currentTarget也就相当于 handler 中的this。 var buttons = document.querySelectorAll(".toolbar button"); var toolbarButtonHandler = function(e) { ...