Execute the following code, click the button, it will pop up a second function of the 'b'. So, now both pop-up, you need to bind the event.
<!DOCTYPE html>
<html>
<head>
<title>绑定事件</title>
</head>
<script type="text/javascript">
window.onload = function(){
var oBtn = document.getElementById('btn1');
oBtn.onclick = function(){
alert('a');
}
oBtn.onclick = function(){
alert('b');
}
}
</script>
<body>
<input id="btn1" type="button" value="提交">
</body>
</html>Binding event using addEventListener (event name, function, false). As follows, after binding the two events, click a button, you can pop up. However, poor compatibility addEventListener used in attachEvent IE.
<!DOCTYPE html>
<html>
<head>
<title>绑定事件</title>
</head>
<script type="text/javascript">
//绑定事件：addEventListener(事件名，函数,false)
window.onload = function(){
var oBtn = document.getElementById('btn1');
oBtn.addEventListener('click',function(){
alert('a');
},false);
oBtn.addEventListener('click',function(){
alert('b');
},false);
// oBtn.onclick = function(){
// alert('a');
// }
// oBtn.onclick = function(){
// alert('b');
// }
}
</script>
<body>
<input id="btn1" type="button" value="提交">
</body>
</html>
