context: assets是程序的图像资源。自动适配各种分辨率的代码如下:{"images":[{"orientation":"portrait","idiom":"iphone","extent":"full-screen","minimum-system-version":"7.0","filename":"Default@2x.png","scale":"2x"},{"extent":"full-screen","idiom":"iphone","subtype":"retina4","filename":"Default-568h@2x.png","minimum-system-version":"7.0","orientation":"portrait","scale":"2x"},{"orientation":"portrait","idiom":"iphone","extent":"full-screen","filename":"Default.png","scale":"1x"},{"orientation":"portrait","idiom":"iphone","extent":"full-screen","filename":"Default@2x.png","scale":"2x"},{"orientation":"portrait","idiom":"iphone","extent":"full-screen","filename":"Default-568h@2x.png","subtype":"retina4","scale":"2x"}
question: assets是什么文件
answers.text: 程序的图像资源