zz如何在js中获得div的位置（一段封装好的代码）
function getElementPos(elementId){ var ua = navigator.userAgent.toLowerCase(); var isOpera = (ua.indexOf('opera') != -1); var isIE = (ua.indexOf('msie') != -1 && !isOpera); // not opera spoof var el = document.getElementById(elementId); if (el.parentNode === null || el.style.display == 'none') { return false; } var parent = null; var pos = []; var box; if (el.getBoundingClientRect) //IE { box = el.getBoundingClientRect(); var scrollTop = Math.max(document.documentElement.scrollTop, document.body.scrollTop); var scrollLeft = Math.max(document.documentElement.scrollLeft, document.body.scrollLeft); return { x: box.left + scrollLeft, y: box.top + scrollTop }; } else if (document.getBoxObjectFor) // gecko { box = document.getBoxObjectFor(el); var borderLeft = (el.style.borderLeftWidth) ? parseInt(el.style.borderLeftWidth) : 0; var borderTop = (el.style.borderTopWidth) ? parseInt(el.style.borderTopWidth) : 0; pos = [box.x - borderLeft, box.y - borderTop]; } else // safari & opera { pos = [el.offsetLeft, el.offsetTop]; parent = el.offsetParent; if (parent != el) { while (parent) { pos[0] += parent.offsetLeft; pos[1] += parent.offsetTop; parent = parent.offsetParent; } } if (ua.indexOf('opera') != -1 || (ua.indexOf('safari') != -1 && el.style.position == 'absolute')) { pos[0] -= document.body.offsetLeft; pos[1] -= document.body.offsetTop; } } if (el.parentNode) { parent = el.parentNode; } else { parent = null; } while (parent && parent.tagName != 'BODY' && parent.tagName != 'HTML') { // account for any scrolled ancestors pos[0] -= parent.scrollLeft; pos[1] -= parent.scrollTop; if (parent.parentNode) { parent = parent.parentNode; } else { parent = null; } } return { x: pos[0], y: pos[1] };}?看的别人博客上的，帮了我大忙啊~传上来，好代码一起分享。