本文实例讲述了JavaScript通过事件代理高亮显示表格行的方法。分享给大家供大家参考。具体实现方法如下：
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Highlight Rows</title> <style type="text/css"> table { background-color: lightgreen; } #third { background-color: yellow; } </style> </head> <body> <!-- Demonstrating "Event Delegation" to highlight table' rows on mouseover. Arguments can be passed via the delegate. My site:andrew.dx.am --> <table id="thetable" summary="highlight demo"> <tr><td>Just one</td><td>.. no another</td></tr> <tr><td>Second</td><td>.. no another</td></tr> <tr id="third"><td>A third</td><td>.. no another</td></tr> <tr><td>Fourth for luck</td><td>.. no another</td></tr> </table> <script type="text/javascript"> var addEvent = function (elem, eventType, func) { if ( elem.addEventListener ) addEvent = function (elem, eventType, func) { elem.addEventListener(eventType, func, false); }; else if ( elem.attachEvent ) addEvent = function (elem, eventType, func) { elem.attachEvent('on' + eventType, func); }; addEvent(elem, eventType, func); }; var delegateEvent = function (elem, childElems, eventType, func, args) { addEvent(elem, eventType, function (e) { var evt = e || window.event; var elem = evt.target || evt.srcElement; if ( elem.nodeName.toLowerCase() == childElems.toLowerCase() ) { func(elem, args); } }); }; function highlightRows(obj, args) { if (args && args.over) { obj.prevColour = obj.parentNode.style.backgroundColor; obj.parentNode.style.backgroundColor = args.colour; if (args.index && obj.title == "") obj.title = "Row " + obj.parentNode.rowIndex; } else { obj.parentNode.style.backgroundColor = ""; if (obj.title.indexOf("Row ") + 1) obj.title = ""; } } function init() { delegateEvent(document.getElementById('thetable'), 'td', 'mouseover', highlightRows, {'colour': 'lightblue', 'over': true, 'index': true}); delegateEvent(document.getElementById('thetable'), 'td', 'mouseout', highlightRows, {'over': false}); } addEvent(window, 'load', init); </script> </body> </html>
希望本文所述对大家的javascript程序设计有所帮助。