<!--
作者：gentiana@163.com
时间：2016-3-10
描述：js事件处理
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>js事件处理</title>
</head>
<body>
<form action="http://www.baidu.com" method="post" >
<button id="btn">按钮123</button>
</form>
<script>
//添加事件
var addEvent = function( obj, type, fn ) {
if (obj.addEventListener){
obj.addEventListener( type, fn, false );
}else if (obj.attachEvent) {
obj["e"+type+fn] = fn;
obj.attachEvent( "on"+type, function() {
obj["e"+type+fn].call(obj, window.event);
} );
}
};
var test = function(e){
alert('Listener');
stopEvent(e);
}
var test2 = function(){
alert('remove');
}
var btn = document.getElementById('btn');
addEvent(btn, 'click', test);
//移除事件
var removeEvent = function( obj, type, fn ) {
if (obj.removeEventListener){
obj.removeEventListener( type, fn, false );
}
else if (obj.detachEvent) {
obj.detachEvent( "on" +type, obj["e"+type+fn] );
obj["e"+type+fn] = null;
}
};
//阻止事件(包括冒泡和默认行为)
var stopEvent = function(e){
e = e || window.event;
if(e.preventDefault) {
e.preventDefault();
e.stopPropagation();
}else{
e.returnValue = false;
e.cancelBubble = true;
}
};
//仅阻止事件冒泡
var stopPropagation = function(e) {
e = e || window.event;
if (e.preventDefault) {
e.cancelBubble = true;
} else {
e.stopPropagation();
}
};
//仅阻止浏览器默认行为
var preventDefault = function(e) {
e = e || window.event;
if(e.preventDefault) {
e.preventDefault();
}else{
e.returnValue = false;
}
}
//取得事件源对象
var getEventTarget = function(e){
e = e || window.event;
var target = event.srcElement ? event.srcElement : event.target;
return target;
};
</script>
</body>
</html>