await checkEndpoint(url);
调试技巧：加打印语句观察每轮变化
，更多细节参见搜狗输入法下载
手机的创新速度，随着手机形态的挖掘和现有科技的限制，大大降低，这个社会与行业的共识已经基本形成。在现有的产品形态下，指望智能手机还能像早期那样，掏出接踵而至的大创新，几乎是不切实际的幻想。
Let’s look at a Silverblue laptop I recently installed, for example:
Due to this more measured approach, error-diffusion dithering is even better at preserving details and can produce a more organic looking final image. However, the algorithm itself is inherently serial and not easily parallelised. Additionally, the propagation of error can cause small discrepancies in one part of the image to cascade into other distant areas. This is very obvious during animation, where pixels will appear to jitter between frames. It also makes files harder to compress.