1、下载之后直接解压得到 一个 ngrok 文件

2、直接终端运行

chmod a+x ngrok

3、开启服务

./ngrok http localhost:8080
或者

./ngrok http 8080
ngrok by @inconshreveable                                                           (Ctrl+C to quit)
                                                                                                    
Session Status                online                                                                
Account                       Harry (Plan: Free)                                                    
Update                        update available (version 2.3.40, Ctrl-U to update)                   
Version                       2.3.38                                                                
Region                        United States (us)                                                    
Web Interface                 http://127.0.0.1:4040                                                 
Forwarding                    http://4b735dffcb70.ngrok.io -> http://localhost:8080                 
Forwarding                    https://4b735dffcb70.ngrok.io -> http://localhost:8080                
                                                                                                    
Connections                   ttl     opn     rt1     rt5     p50     p90                           
                              0       0       0.00    0.00    0.00    0.00