对事件目标对象注册事件侦听器 addEventListener - 《代码片段》

兼容各浏览器，表示在冒泡阶段调用事件处理程序 (true 捕获阶段)
addEvent: function(selector, eventType, func){
var proName = “”;

        switch(true){<br />                case /^\./.test(selector) :<br />                    proName = "className";<br />                    selector = selector.replace(".", "");<br />                    break;<br />                case /^\#/.test(selector) :<br />                    proName = "id";<br />                    selector = selector.replace("#", "");<br />                    break;<br />                default:<br />                    proName = "tagName";<br />            }
        document.body.addEventListener(eventType,function(e){<br />                    function check(node){<br />                        if(! node.parentNode) return;
                    if(node[proName] == selector){<br />                            func.call(node, e);<br />                        };<br />                        check(node.parentNode);<br />                    }<br />                    check(e.target);<br />            }, false);<br />        }