Question

如何通过javascript脚本，把一个层固定在屏幕右上角

Answer 1

用JS设置css属性(style)为 position:absolute;top:0;right:0

Answer 2

document.body.onload=function(){
var div = document.getElementById("xx");
div.style.positon="absolute";
div.style.right="0px";
div.style.top="0px";
}

window.onscroll=function(){
var div = document.getElementById("xx");
div.style.top=(document.body.scrollTop||document.documentElement.scrollTop)+'px';
}

Answer 3

假如这个层的id是obj，那么
window.onload=function(){
document.getElementById('obj').style.position="fixed";
document.getElementById('obj').style._position="absolute";
document.getElementById('obj').style.top=0;
document.getElementById('obj').style.right=0;
}