$.ajax({ type: 'delete', method: 'delete', url: '/BookShopSystem_war/deleteBookById/' + data.bookId, data: {"bookId": data.bookId}, dataType: 'json', success: function (result) { if (result.code == 0) { layer.msg(result.msg); table.reload("table") } else { layer.msg(result.msg) } } })@DeleteMapping("/deleteBookById/{bookId}") @ResponseBody public Map<String, Object> deleteBookById(@PathVariable("bookId") Integer bookId) { int deleteResult = adminService.deleteBookById(bookId); if (!(deleteResult == 1)) { System.out.println("删除失败"); } Map<String, Object> result = new HashMap<>(); result.put("code", 0); result.put("msg", "删除成功"); return result; }如果调用该接口还需要一个参数userId,那么应该如何修改

如果调用该接口需要传递userId参数，可以将该参数作为请求参数传递给后台，在Controller中使用@RequestParam注解获取该参数，例如：

前端代码：

$.ajax({
    type: 'delete',
    method: 'delete',
    url: '/BookShopSystem_war/deleteBookById/' + data.bookId,
    data: {
        "bookId": data.bookId,
        "userId": userId
    },
    dataType: 'json',
    success: function (result) {
        if (result.code == 0) {
            layer.msg(result.msg);
            table.reload("table")
        } else {
            layer.msg(result.msg)
        }
    }
});

后端Controller代码：

@DeleteMapping("/deleteBookById/{bookId}")
@ResponseBody
public Map<String, Object> deleteBookById(@PathVariable("bookId") Integer bookId, @RequestParam Integer userId) {
    int deleteResult = adminService.deleteBookById(bookId);
    if (!(deleteResult == 1)) {
        System.out.println("删除失败");
    }
    Map<String, Object> result = new HashMap<>();
    result.put("code", 0);
    result.put("msg", "删除成功");
    return result;
}

在Controller方法的参数列表中，添加@RequestParam注解，用于获取请求参数中的userId值。