yzm7nJbz8673092(提问者)原始数据是[{\"category\":\"reference\",\"author\":\"Nigel Rees\",\"title\":\"Sayings of the Century\",\"price\":8.95},{\"category\":\"fiction\",\"author\":\"Evelyn Waugh\",\"title\":\"Sword of Honour\",\"price\":12.99},{\"category\":\"fiction\",\"author\":\"Herman Melville\",\"title\":\"Moby Dick\",\"price\":8.99,\"isbn\":\"0-553-21311-3\"},{\"category\":\"fiction\",\"author\":\"J.R.R. Tolkien\",\"title\":\"The Lord of the Rings\",\"price\":22.99,\"isbn\":\"0-395-19323-5\"}]