设置:
document.getElementById('id').style.width=value
document.getElementById('id').style.height=value
document.getElementById('id').style.top=value
document.getElementById('id').style.left=value
获取:
value=document.getElementById('id').offsetLeft
value=document.getElementById('id').offsetTop
value=document.getElementById('id').offsetWidth
value=document.getElementById('id').offsetHeight
找一个元素的坐标：
function findPosition( oElement )
{
var x2 = 0;
var y2 = 0;
var width = oElement.offsetWidth;
var height = oElement.offsetHeight;
alert(width + "=" + height);
if( typeof( oElement.offsetParent ) != 'undefined' )
{
for( var posX = 0, posY = 0; oElement; oElement = oElement.offsetParent )
{
posX += oElement.offsetLeft;
posY += oElement.offsetTop;
}
x2 = posX + width;
y2 = posY + height;
return [ posX, posY ,x2, y2]; } else{
x2 = oElement.x + width;
y2 = oElement.y + height;
return [ oElement.x, oElement.y, x2, y2];
}
}
知识进阶，二级导航展示隐藏效果问题（鼠标经过一级菜单二级菜单展示，鼠标离开一级菜单相应的二级菜单隐藏，而导致鼠标在一级菜单和二级菜单过渡过程中二级菜单隐藏，无法点到二级菜单）：
$("一级导航菜单").mouseover(function() {
var index = $(this).find("a").attr("index");
$(".list-1st2-li").removeClass("list-spread"); //先删除掉所有一级菜单展开的样式
$(".sp-item-" + index).addClass("list-spread");//
});
//鼠标离开时判断鼠标是否在当前li范围内部，如果不是就去掉list-spread类样式
$("一级导航菜单").mouseleave(function(event) {
var oElement = $(this)[0];
var x = event.clientX;
var y = event.clientY;
var x1 = 0;
var y1 = 0;
var x2 = 0;
var y2 = 0;
var width = oElement.offsetWidth;
var height = oElement.offsetHeight;
if(typeof(oElement.offsetParent) != 'undefined') {
for(var posX = 0, posY = 0; oElement; oElement = oElement.offsetParent) {
posX += oElement.offsetLeft;
posY += oElement.offsetTop;
}
x1 = posX;
y1 = posY;
x2 = posX + width;
y2 = posY + height;
} else {
x1 = oElement.x;
y1 = oElement.y;
x2 = oElement.x + width;
y2 = oElement.y + height;
}
//鼠标不在一级导航菜单元素内部
if(x <= x1 || x >= x2 || y <= y1 || y >= y2) {
var index = $(this).find("a").attr("index");
$(".sp-item-" + index).removeClass("list-spread");
}
});
$("二级子菜单").mouseout(function() {
$(this).removeClass("list-spread");
});