<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<input type="button" value="anniu" id="btn" name="">
<script type="text/javascript">
var btn=document.getElementById("btn");
function st(){
alert("sd")
}
btn.onclick=st;
</script>
</body>
</html>
is written as btn.onclick=st (); , the page opens and alert pops up directly. Why? How does this work?
btn.onclick=st();is equivalent to executing st () and assigning st () to btn.onclick
btn.onclick=st()
document.getElementById('btn').onclick = function(){
alert("sd")
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