jQuery offset 定位 原理

jQuery.noConflict();<br />jQuery(document).ready(showNavigationHr);<br />jQuery(window).resize(showNavigationHr);<br />function showNavigationHr()<br />{<br /> var to = jQuery("#navhr");<br /> var source = getSelectedNavigation();<br /> if(source==null)<br /> return null;<br /> var width = source.width();<br /> var top = source.offset().top;<br /> var left = source.offset().left;<br /> try{<br /> to.width(width);<br /> var fixTop = 50;</p><p> to.css("top", top+fixTop);<br /> to.css("left", left);<br /> }catch(err){<br /> }</p><p> function getSelectedNavigation(){<br /> var __tabindex = jQuery("#tabindex").html();<br /> if(__tabindex == "")<br /> __tabindex ="family_register";<br /> return jQuery("#"+__tabindex);<br /> }<br /> //for mainws resize to adapt<br /> var resizewidth = jQuery("#rightDiv").width() - jQuery("#vmenu").width() - 105;</p><p> jQuery("#mainws").width(resizewidth);<br />}