Laravel中的Javascript全局问题

Question

我在laravel中引用app.js文件时遇到2个错误，不知道为什么吗？

1. Uncaught ReferenceError: $ is not defined

   refer to: <script> $(function () { $('[data-toggle="tooltip"]').tooltip() }); </script>

2. Uncaught TypeError: Cannot call a class as a function

   refer to: function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); //here } }

PS：app.js文件将创建并合并来自node.js的所有资产。

问题

我该如何解决？