通用事件绑定方法
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style type="text/css"> *{ margin: 0; padding: 0; } body{ margin: 100px; } </style> </head> <body> <div id="box"> <p id="p1">p1</p> <p id="p2">p2</p> <p id="p3">p3</p> <a href="http://baidu.com" id="a1">a1</a> <a href="http://baidu.com" id="a2">a2</a> <a href="http://baidu.com" id="a3">a3</a> </div> </body> </html>
<script type="text/javascript"> var box = document.getElementById("box"); addEvent(box,"click","a",function(e){ e.preventDefault(); console.log(123); }); var p2 = document.getElementById("p2"); addEvent(p2,"click",function(e){ e.preventDefault(); console.log(e.target); }); function addEvent(el,type,selector,fn){ if(fn==null){ fn = selector; selector = null; } el.addEventListener(type,function(e){ var target; if(selector){ // 代理 target = e.target; if(target.matches(selector)){ fn.call(target,e) } } else { // 不代理 fn(e); } }); } </script>
posted on 2017-12-02 19:29 jasonduanmu 阅读(138) 评论(0) 编辑 收藏 举报