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add_library(stbiw STATIC stb_image_write.cpp)，把文件添加到库里
target_include_directories(stbiw PUBLIC .)，让要使用这个库的文件，可以像访问当前目录一样访问他
#define STB_IMAGE_WRITE_IMPLEMENTATION， （纯0基础萌新，看视频也找不到答案，不知道需要补什么知识。。）这一步我不懂，根据老师的提示信息，一次次尝试出来的。。。
#include <stb_image_write.h>，添加头文件进去。
我的理解是，stbiw的作用就是将需要的功能打包起来，以后需要用到，直接在CMake里设置导入就行，把功能变成一个个模块，拿过来就用，类似原子性的思想