git下载安装检查

参考网址：https://blog.csdn.net/shuikanshui/article/details/118295952?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2_{aggregatepage}first_rank_ecpm_v1~rank_v31_ecpm-2-118295952.pc_agg_new_rank&utm_term=windows%E6%80%8E%E4%B9%88%E6%A3%80%E6%9F%A5+git%E5%AE%89%E8%A3%85%E6%88%90%E5%8A%9F&spm=1000.2123.3001.4430