事件(Event)是JavaScript应用跳动的心脏 ，也是把所有东西粘在一起的胶水。当我们与浏览器中 Web 页面进行某些类型的交互时，事件就发生了。事件可能是用户在某些内容上的点击、鼠标经过某个特定元素或按下键盘上的某些按键。事件还可能是 Web 浏览器中发生的事情，比如说某个 Web 页面加载完成，或者是用户滚动窗口或改变窗口大小。
通过使用 JavaScript ，你可以监听特定事件的发生，并规定让某些事件发生以对这些事件做出响应。
一、添加事件监听
IE:
复制代码 代码如下:
attachEvent("onclick",function(){...}) //添加
detachEvent("onclick",function(){...}) //删除
FF:
复制代码 代码如下:
addEventListener("click",function(){...},false)
//可以跟一个对象添加多个事件监听，跟默认的对象事件不同
removeEventListenner("click",function(){...},false)
二、得到事件对象
IE:
复制代码 代码如下:
op.onClick=function(){
ver oevent = window.event; //作为window的一个属性
}
FF：
复制代码 代码如下:
op.onClick=function(oevent){
.... //通过传入参数来控制
}
通用：
复制代码 代码如下:
op.onClick=function(oevent){
if(window.event){
oevent=window.event;
}
}
//即时得到了通用的，但是他们返回对象的属性和方法也不尽一致，但可以使用通过EventUtil来解决！
var EventUtil = new Object; /**//* 此方法用来给特定对象添加事件，oTarget是指定对象,sEventType是事件类型，如click、keydown等， fnHandler是事件回调函数 */ EventUtil.addEventHandler = function (oTarget, sEventType, fnHandler) { //firefox情况下 if (oTarget.addEventListener) { oTarget.addEventListener(sEventType, fnHandler, false); } //IE下 else if (oTarget.attachEvent) { oTarget.attachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = fnHandler; } }; /* 此方法用来移除特定对象的特定事件，oTarget是指定对象,sEventType是事件类型，如click、keydown等，fnHandler是事件回调函数 */ EventUtil.removeEventHandler = function (oTarget, sEventType, fnHandler) { if (oTarget.removeEventListener) { oTarget.removeEventListener(sEventType, fnHandler, false); } else if (oTarget.detachEvent) { oTarget.detachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = null; } }; /* 格式化事件，因为IE和其他浏览器下获取事件的方式不同并且事件的属性也不尽相同，通过此方法提供一个一致的事件 */ EventUtil.formatEvent = function (oEvent) { //isIE和isWin引用到一个js文件，判断浏览器和操作系统类型 if (isIE && isWin) { oEvent.charCode = (oEvent.type == "keypress") ? oEvent.keyCode : 0; //IE只支持冒泡，不支持捕获 oEvent.eventPhase = 2; oEvent.isChar = (oEvent.charCode > 0); oEvent.pageX = oEvent.clientX + document.body.scrollLeft; oEvent.pageY = oEvent.clientY + document.body.scrollTop; //阻止事件的默认行为 oEvent.preventDefault = function () { this.returnValue = false; }; //将toElement,fromElement转化为标准的relatedTarget if (oEvent.type == "mouseout") { oEvent.relatedTarget = oEvent.toElement; } else if (oEvent.type == "mouseover") { oEvent.relatedTarget = oEvent.fromElement; } //取消冒泡 oEvent.stopPropagation = function () { this.cancelBubble = true; }; oEvent.target = oEvent.srcElement; //添加事件发生时间属性，IE没有 oEvent.time = (new Date).getTime(); } return oEvent; }; EventUtil.getEvent = function() { if (window.event) { //格式化IE的事件 return this.formatEvent(window.event); } else { return EventUtil.getEvent.caller.arguments[0]; } };
/* *附带上一个判断浏览器和系统类型的js文件，通过引入一些名字显而易见的全局变量作为判断的结果，使用时需要小心变量名称冲突： */ var sUserAgent = navigator.userAgent; var fAppVersion = parseFloat(navigator.appVersion); function compareVersions(sVersion1, sVersion2) { var aVersion1 = sVersion1.split("."); var aVersion2 = sVersion2.split("."); if (aVersion1.length > aVersion2.length) { for (var i=0; i < aVersion1.length - aVersion2.length; i++) { aVersion2.push("0"); } } else if (aVersion1.length < aVersion2.length) { for (var i=0; i < aVersion2.length - aVersion1.length; i++) { aVersion1.push("0"); } } for (var i=0; i < aVersion1.length; i++) { if (aVersion1[i] < aVersion2[i]) { return -1; } else if (aVersion1[i] > aVersion2[i]) { return 1; } } return 0; } var isOpera = sUserAgent.indexOf("Opera") > -1; var isMinOpera4 = isMinOpera5 = isMinOpera6 = isMinOpera7 = isMinOpera7_5 = false; if (isOpera) { var fOperaVersion; if(navigator.appName == "Opera") { fOperaVersion = fAppVersion; } else { var reOperaVersion = new RegExp("Opera (//d+//.//d+)"); reOperaVersion.test(sUserAgent); fOperaVersion = parseFloat(RegExp["$1"]); } isMinOpera4 = fOperaVersion >= 4; isMinOpera5 = fOperaVersion >= 5; isMinOpera6 = fOperaVersion >= 6; isMinOpera7 = fOperaVersion >= 7; isMinOpera7_5 = fOperaVersion >= 7.5; } var isKHTML = sUserAgent.indexOf("KHTML") > -1 || sUserAgent.indexOf("Konqueror") > -1 || sUserAgent.indexOf("AppleWebKit") > -1; var isMinSafari1 = isMinSafari1_2 = false; var isMinKonq2_2 = isMinKonq3 = isMinKonq3_1 = isMinKonq3_2 = false; if (isKHTML) { isSafari = sUserAgent.indexOf("AppleWebKit") > -1; isKonq = sUserAgent.indexOf("Konqueror") > -1; if (isSafari) { var reAppleWebKit = new RegExp("AppleWebKit///(//d+(?://.//d*)?)"); reAppleWebKit.test(sUserAgent); var fAppleWebKitVersion = parseFloat(RegExp["$1"]); isMinSafari1 = fAppleWebKitVersion >= 85; isMinSafari1_2 = fAppleWebKitVersion >= 124; } else if (isKonq) { var reKonq = new RegExp("Konqueror///(//d+(?://.//d+(?://.//d)?)?)"); reKonq.test(sUserAgent); isMinKonq2_2 = compareVersions(RegExp["$1"], "2.2") >= 0; isMinKonq3 = compareVersions(RegExp["$1"], "3.0") >= 0; isMinKonq3_1 = compareVersions(RegExp["$1"], "3.1") >= 0; isMinKonq3_2 = compareVersions(RegExp["$1"], "3.2") >= 0; } } var isIE = sUserAgent.indexOf("compatible") > -1 && sUserAgent.indexOf("MSIE") > -1 && !isOpera; var isMinIE4 = isMinIE5 = isMinIE5_5 = isMinIE6 = false; if (isIE) { var reIE = new RegExp("MSIE (//d+//.//d+);"); reIE.test(sUserAgent); var fIEVersion = parseFloat(RegExp["$1"]); isMinIE4 = fIEVersion >= 4; isMinIE5 = fIEVersion >= 5; isMinIE5_5 = fIEVersion >= 5.5; isMinIE6 = fIEVersion >= 6.0; } var isMoz = sUserAgent.indexOf("Gecko") > -1 && !isKHTML; var isMinMoz1 = sMinMoz1_4 = isMinMoz1_5 = false; if (isMoz) { var reMoz = new RegExp("rv:(//d+//.//d+(?://.//d+)?)"); reMoz.test(sUserAgent); isMinMoz1 = compareVersions(RegExp["$1"], "1.0") >= 0; isMinMoz1_4 = compareVersions(RegExp["$1"], "1.4") >= 0; isMinMoz1_5 = compareVersions(RegExp["$1"], "1.5") >= 0; } var isNS4 = !isIE && !isOpera && !isMoz && !isKHTML && (sUserAgent.indexOf("Mozilla") == 0) && (navigator.appName == "Netscape") && (fAppVersion >= 4.0 && fAppVersion < 5.0); var isMinNS4 = isMinNS4_5 = isMinNS4_7 = isMinNS4_8 = false; if (isNS4) { isMinNS4 = true; isMinNS4_5 = fAppVersion >= 4.5; isMinNS4_7 = fAppVersion >= 4.7; isMinNS4_8 = fAppVersion >= 4.8; } var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows"); var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh"); var isUnix = (navigator.platform == "X11") && !isWin && !isMac; var isWin95 = isWin98 = isWinNT4 = isWin2K = isWinME = isWinXP = false; var isMac68K = isMacPPC = false; var isSunOS = isMinSunOS4 = isMinSunOS5 = isMinSunOS5_5 = false; if (isWin) { isWin95 = sUserAgent.indexOf("Win95") > -1 || sUserAgent.indexOf("Windows 95") > -1; isWin98 = sUserAgent.indexOf("Win98") > -1 || sUserAgent.indexOf("Windows 98") > -1; isWinME = sUserAgent.indexOf("Win 9x 4.90") > -1 || sUserAgent.indexOf("Windows ME") > -1; isWin2K = sUserAgent.indexOf("Windows NT 5.0") > -1 || sUserAgent.indexOf("Windows 2000") > -1; isWinXP = sUserAgent.indexOf("Windows NT 5.1") > -1 || sUserAgent.indexOf("Windows XP") > -1; isWinNT4 = sUserAgent.indexOf("WinNT") > -1 || sUserAgent.indexOf("Windows NT") > -1 || sUserAgent.indexOf("WinNT4.0") > -1 || sUserAgent.indexOf("Windows NT 4.0") > -1 && (!isWinME && !isWin2K && !isWinXP); } if (isMac) { isMac68K = sUserAgent.indexOf("Mac_68000") > -1 || sUserAgent.indexOf("68K") > -1; isMacPPC = sUserAgent.indexOf("Mac_PowerPC") > -1 || sUserAgent.indexOf("PPC") > -1; } if (isUnix) { isSunOS = sUserAgent.indexOf("SunOS") > -1; if (isSunOS) { var reSunOS = new RegExp("SunOS (//d+//.//d+(?://.//d+)?)"); reSunOS.test(sUserAgent); isMinSunOS4 = compareVersions(RegExp["$1"], "4.0") >= 0; isMinSunOS5 = compareVersions(RegExp["$1"], "5.0") >= 0; isMinSunOS5_5 = compareVersions(RegExp["$1"], "5.5") >= 0; } }
以上就是js事件处理，希望能给大家一个参考，也希望大家多多支持脚本之家。
您可能感兴趣的文章: