您好，我正在尝试学习反应导航的基础知识，并且正在为我的简单应用程序设置背景图像。我希望背景图片适合背景，并且我使用了ImageBackground，因此可以在其中使用组件。问题是我不断收到此错误TypeError：undefined不是一个对象（正在评估style.width）
https://www.facebook.com/login.php?next=https%3A%2F%2Fwww.facebook.com%2Fplugins%2Ferror%2Fconfirm%2Fpage%3Fiframe_referer%3Dhttps%253A%252F%252Fwww.lifeleap.org%252Fis-my-relationship-right-for-me%252F%26kid_directed_site%3Dfalse%26secure%3Dtrue%26plugin%3Dpage%26return_params%3D%257B%2522app_id%2522%253A%2522%2522%252C%2522channel%2522%253A%2522https%253A%252F%252Fstaticxx.facebook.com%252Fconnect%252Fxd_arbiter%252Fr%252Fj-GHT1gpo6-.js%253Fversion%253D43%2523cb%253Df246ad6b1a27112%2526domain%253Dwww.lifeleap.org%2526origin%253Dhttps%25253A%25252F%25252Fwww.lifeleap.org%25252Ff15a3bdc42a846e%2526relation%253Dparent.parent%2522%252C%2522container_width%2522%253A%2522370%2522%252C%2522hide_cover%2522%253A%2522false%2522%252C%2522href%2522%253A%2522https%253A%252F%252Fwww.facebook.com%252Flifeleap%2522%252C%2522locale%2522%253A%2522en_US%2522%252C%2522sdk%2522%253A%2522joey%2522%252C%2522show_facepile%2522%253A%2522false%2522%252C%2522show_posts%2522%253A%2522false%2522%252C%2522width%2522%253A%2522350%2522%252C%2522ret%2522%253A%2522sentry%2522%252C%2522act%2522%253Anull%257D
答案 0 :(得分：0)
从代码来看，我认为您输入错误，而不是SELECT n.*, m.* FROM news n LEFT JOIN news_meta m ON m.news_id = n.news_id ORDER BY n.id DESC;
/* $dbdata will then contain your two tables worth of data: */
echo json_encode($dbdata);
，应该是Style={...}