<!DOCTYPE HTML>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>alert</title>
<script type="text/javascript">
function rec(){
var mychar="I love JavaScript";
alert(mychar);
}
rec();
</script>
</head>
<body>
</body>
</html>求解为什么这段代码会自己跳出窗口？
