JavaScript 函数 handleQueryNewsId() - 查询新闻 ID 并验证

The function 'handleQueryNewsId' is used to handle the query for a specific news ID.

1. The 'loading' variable is set to 'true' to indicate that the query is in progress.
2. The 'thisNewsId' variable is assigned the value of 'formData.newsId', which is the inputted news ID.
3. The 'getNewsPage' function is called with the parameters 'newsId: thisNewsId', 'page: 1', and 'pageSize: 10' to retrieve the news page with the specified news ID.
4. The retrieved data is logged to the console.
5. The 'newsIds' variable is assigned an array of news IDs extracted from the retrieved data.
6. If the 'newsIds' array includes the 'thisNewsId', it means that the news ID exists. In this case, a message is logged to indicate that the news ID is on sale.
7. If the 'newsIds' array does not include the 'thisNewsId', it means that the news ID does not exist. In this case, a message is logged to indicate that the news ID does not exist.
8. The 'newsList' variable is assigned the value of 'data.rows', which contains the retrieved news data.
9. The 'total' variable is assigned the value of 'data.total', which represents the total number of news pages.
10. Finally, the 'loading' variable is set to 'false' to indicate that the query is complete.