<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>eventObject</title></head>
<body>
<input type="button" id="myBtn" value="clickMe" />
<input type="button" id="myRemoveBtn" value="remove event handler" />
<script type="text/javascript">
var btn = document.getElementById("myBtn");
btn.attachEvent("onclick",function(){
alert("clicked");
});
</script>
</body>
</html>请问,js代码放入head标签内,怎么就出错了?
window.onload=function(){ var btn = document.getElementById("myBtn");
btn.attachEvent("onclick",function(){
alert("clicked");
});
}
</script>
放入head标签内,出错是因为<input type="button" id="myBtn" value="clickMe" />
还没加载出来
放在head中,可以把脚本放在
window.onload = function(){
// code
}