示例控制器：
public ActionResult Index()
{
ViewBag.js = "<script type='text/javascript'>alert('abc');</script>";
return View();
}
页面：
<html>
<head>
<title>Demo</title>
</head>
<body>
<div>
@Html.Raw(ViewBag.js)
</div>
</body>
</html>
就可以了