javascript事件處理模型實例說明

事件(Event)是JavaScript應用跳動的心臟，也是把所有東西粘在一起的膠水。當我們與瀏覽器中Web 頁面進行某些類型的交互時，事件就發生了。事件可能是用戶在某些內容上的點擊、鼠標經過某個特定元素或按下鍵盤上的某些按鍵。事件還可能是Web 瀏覽器中發生的事情，比如說某個Web 頁面加載完成，或者是用戶滾動窗口或改變窗口大小。

通過使用JavaScript ，你可以監聽特定事件的發生，並規定讓某些事件發生以對這些事件做出響應。

一、添加事件監聽

IE:

複製代碼代碼如下:attachEvent("onclick",function(){...}) //添加

detachEvent("onclick",function(){...}) //刪除

FF:

複製代碼代碼如下:addEventListener("click",function(){...},false)

//可以跟一個對象添加多個事件監聽，跟默認的對象事件不同

removeEventListenner("click",function(){...},false)

二、得到事件對象

IE:

複製代碼代碼如下:op.onClick=function(){

ver oevent = window.event; //作為window的一個屬性

}

FF：

複製代碼代碼如下:op.onClick=function(oevent){

.... //通過傳入參數來控制

}

通用：

複製代碼代碼如下:op.onClick=function(oevent){

if(window.event){

oevent=window.event;

}

}

//即時得到了通用的，但是他們返回對象的屬性和方法也不盡一致，但可以使用通過EventUtil來解決！

 var EventUtil = new Object;/**//* 此方法用來給特定對象添加事件，oTarget是指定對象,sEventType是事件類型，如click、keydown等， fnHandler是事件回調函數*/EventUtil.addEventHandler = function (oTarget, sEventType, fnHandler) { //firefox情況下if (oTarget.addEventListener) { oTarget.addEventListener(sEventType, fnHandler, false); } //IE下else if (oTarget.attachEvent) { oTarget.attachEvent("on" + sEventType, fnHandler); } else { oTarget["on" + sEventType] = fnHandler; }};/* 此方法用來移除特定對象的特定事件，oTarget是指定對象,sEventType是事件類型，如click、keydown等，fnHandler是事件回調函數*/ 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，因為IE和其他瀏覽器下獲取事件的方式不同並且事件的屬性也不盡相同，通過此方法提供一個一致的事件*/EventUtil.formatEvent = function (oEvent) { //isIE和isWin引用到一個js文件，判斷瀏覽器和操作系統類型if (isIE && isWin) { oEvent.charCode = (oEvent.type == "keypress") ? oEvent.keyCode : 0; //IE只支持冒泡，不支持捕獲oEvent.eventPhase = 2; oEvent.isChar = (oEvent.charCode > 0); oEvent.pageX = oEvent.clientX + document.body.scrollLeft; oEvent.pageY = oEvent.clientY + document.body.scrollTop; //阻止事件的默認行為oEvent.preventDefault = function () { this.returnValue = false; }; //將toElement,fromElement轉化為標準的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; //添加事件發生時間屬性，IE沒有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]; }};

 /**附帶上一個判斷瀏覽器和系統類型的js文件，通過引入一些名字顯而易見的全局變量作為判斷的結果，使用時需要小心變量名稱衝突：*/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事件處理，希望能給大家一個參考，也希望大家多多支持武林網。