[springboot+thymeleaf ] 前台js读取后台传值

后台代码：通过ModelAndView类型返回

@RequestMapping(value = "/list", method = RequestMethod.GET)
    public ModelAndView list(@RequestParam(value = "pageNum", defaultValue = "1") int pageNum,
                             @RequestParam(value = "pageSize", defaultValue = "10") int pageSize) {
        Page<User> page = PageHelper.startPage(pageNum, pageSize);
        List<User> userList = userService.findAll();
        page.addAll(userList);
        ModelAndView model = new ModelAndView("demo_user","page",page);
        model.addObject("websocketUrl", "ws://localhost:8080/websocket");
        return model;
    }

前台Html：通过隐藏input元素传值

<input id="websocketUrl" type="hidden" th:value="${websocketUrl}" />

前台JS：

$("#websocketUrl").val();

注意：前台需要${websocketUrl}形式读取后台传值时，注意使用thymeleaf的类型标签“th:xx”，使用html默认标签很多都不能读取${websocketUrl}。