vue高级程序设计，JavaScript高级程序设计之EventUtil

简单的通用事件方法

var EventUtil = {getEvent: function (e) {return e || window.event;},getTarget: function (e) {return e.target || e.srcElement;},preventDefault: function (e) {if (e && e.preventDefault) {e.preventDefault();} else {window.event.returnValue = false;}},stopPropagation: function (e) {if (e && e.stopPropagation) {e.stopPropagation();} else {e.cancelBubble = true;}},addHandler: function (ele, evType, fn, useCapture) {// 默认使用事件冒泡useCapture = useCapture || false;if (ele.addEventListener) {ele.addEventListener(evType, fn, useCapture);} else if (ele.attachEvent) {ele.attachEvent("on" + evType, function () {// fn中的this指向ele对象:ie的问题
                fn.call(ele);  });} else {ele["on" + evType] = fn;}},removeHandler: function (ele, evType, fn) {if (ele.removeEventListener) {ele.removeEventListener(evType, fn);} else if (ele.detachEvent) {ele.detachEvent("on" + evType, fn);} else {ele["on" + evType] = null;}},// keypess事件的charCode
    getCharCode: function (e) {if (typeof e.charCode === "number") {return e.charCode;} else {return e.keyCode; // ie8及之前版本
        }}
};