Firefox和IE浏览器兼容JS脚本写法小结

1.window.event兼容脚本 

function getEvent() { //获取浏览器事件，同时兼容ie和ff的写法
    if (document.all) return window.event;
    func = getEvent.caller;
    while (func != null) {
        var arg0 = func.arguments[0];
        if (arg0) {
            if ((arg0.constructor == Event    arg0.constructor == MouseEvent
        )
            (typeof (arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)
        )
            {
                return arg0;
            }
        }
        func = func.caller;
    }
    return null;
} 

每次用事件之前Firefox都需要用getEvent()获取一下，否则就是空 

2.屏蔽Form提交事件 

event.returnValue=false;// for IE 
evt.preventDefault();//for firefox 

3.获取事件源 

var source=event.srcElement //IE 
var source=event.target //firefox 

4.添加事件兼容写法 

function addEvent(oElement,sEvent,func){
    if (oElement.attachEvent){
        oElement.attachEvent(sEvent,func);
    }
    else{
        sEvent=sEvent.substring(2,sEvent.length);
        oElement.addEventListener(sEvent,func,false);
    }
} 

用法：addEvent(window,”onload”,Start); 

5.Firefox注册innerText写法 

function isIE() { //ie?
    if (window.navigator.userAgent.toLowerCase().indexOf("msie") >= 1)
        return true;
    else
        return false;
}

if (!isIE()) { //firefox innerText define
    HTMLElement.prototype.__defineGetter__("innerText",
        function () {
            var anyString = "";
            var childS = this.childNodes;
            for (var i = 0; i < childS.length; i++) {
                if (childS[i].nodeType == 1)
                    anyString += childS[i].tagName == "BR" ? ‘\n
                ' : childS[i].textContent;
            else
                if (childS[i].nodeType == 3)
                    anyString += childS[i].nodeValue;
            }
            return anyString;
        }
    );
    HTMLElement.prototype.__defineSetter__("innerText",
        function (sText) {
            this.textContent = sText;
        }
    );
}

6.长度：FireFox长度必须加“px”，IE无所谓 

7.父控件下的子控件：IE是“children”，FireFox是“childNodes” 

8.XmlHttp 

在IE中，XmlHttp.send(content)方法的content可以为空，而firefox则不能为空，应该用send(” “)，否则会出现411错误