document.write("welcom to my website");
function callAlert(){
alert('我被点击一下');
}
window.onload = function () {
alert("欢迎光临萌萌小店!");
}
window.onbeforeunload = function (event) {
var e = event || window.event;
e.returnValue = "记得下来再来喔!";
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<!--script>
function callAlert(){
alert('我被点击一下');
}
</script-->
</head
<body>
<button onclick="alert=('我被点击')">点我</button>
<button onclick="callAlert()">点我一下 </button>
<script>
//alert("Hi!")
</script>
</body>
</html>