js阻止取消冒泡和阻止默认行为(兼容性写法)

取消冒泡兼容性写法

function canclebubble(event){
    var event = event||window.event;        //兼容火狐
    if(event.stopPropagation){
        event.stopPropagation();            //标准浏览器
    }else{
        event.cancaleBubble==true;          //老ie
    }
}   

阻止默认行为兼容性写法

function stopevent(event){
    var event = event||window.event;        //兼容火狐
    if(event.preventDefault){
        event.preventDefault();             //标准浏览器
    }else{
        event.returnValue==false;           //老ie
    }
}