js 事件委托

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<!DOCTYPE html><html> <head> <title>event</title> <meta http-equiv="Content-type" content="text/html; charset=utf-8" /> </head> <body> <ul id="ul1"> <li>1</li> <li>2</li> <li>3</li> </ul> <script type="text/javascript"> var oUl = $("ul1"); function $(id) { return document.getElementById(id); } oUl.onclick = function (ev) { var ev = ev || event; var target = ev.target || ev.srcElement; if (target.nodeName.toLowerCase() == "li") { alert(target.innerHTML); } } </script> </body></html>