js获取窗口参数

    window.onscroll=function getScrollTop(){
        console.log(scrollTop)
        if(document.documentElement&&document.documentElement.scrollTop){
            scrollTop=document.documentElement.scrollTop;
        }else if(document.body){
            scrollTop=document.body.scrollTop;
        }
        console.log(scrollTop)
        return scrollTop;
    }

上图是兼容主要游览器的获取滚动条实时高度的，

function getWindow () {
    if(typeof window.innerWidth !='undefined') {
        return{
            width : window.innerWidth,
            height : window.innerHeight
        }
    } else{
        return {
            width : document.documentElement.clientWidth,
            height : document.documentElement.clientHeight
        }
    }
};
window.onresize=function () {
    console.log(getWindow ().width,getWindow ().height)

}

上图是简单的获取窗口可视宽高

    function mousePosition(ev){
        if(ev.pageX || ev.pageY){
            return {x:ev.pageX, y:ev.pageY};
        }
        return {
            x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
            y:ev.clientY + document.body.scrollTop - document.body.clientTop
        };
    }
    function mouseMove(ev){
        ev = ev || window.event;
        var mousePos = mousePosition(ev);
        document.getElementById('xxx').value = mousePos.x;
        document.getElementById('yyy').value = mousePos.y;
    }
    document.onmousemove = mouseMove;
</script>
X:<input id="xxx" type="text" /> Y:<input id="yyy" type="text" />

上图是获取坐标的函数