<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
var show=(a,b=7)=>{
console.log("我是其他的内容");
return a+b;
}
alert(show(5));
</script>
</body>
</html>