5.13

//获取屏幕可视区域的宽高(仿jQuery)

function client(){
    if(window.innerHeight !== undefined){
        return {
            "width": window.innerWidth,
            "height": window.innerHeight
        }
    }else if(document.compatMode === "CSS1Compat"){
        return {
            "width": document.documentElement.clientWidth,
            "height": document.documentElement.clientHeight
        }
    }else{
        return {
            "width": document.body.clientWidth,
            "height": document.body.clientHeight
        }
    }
}

//阻止时间冒泡

var box = document.getElementById("box");
box.onmouseover = function (event) {
    console.log("鼠标放到了box上");
    //阻止冒泡
    event = event || window.event;

    if(event && event.stopPropagation){
        event.stopPropagation();
    }else{
        event.cancelBubble = true;
    }
}

//捕获时间对象（兼容性写法）

box.onclick=function(event){

event=event=||window.event;

var aaa=event.target?event.target:event.srcElement;

}