thymeleaf of [[.....]] inline simplifies the problem thymeleaf the value, for example as follows:
<-- 从session中取值 -->
<div>[[${session.username}]]</div>
Equivalent to:
<div th:text="${session.username}"></div>
To put it bluntly, it is the text value.
But in JavaScript, you need to add th:inline="javascript">
<script th:inline="javascript">
var user = [[${session.username}]];
</script>