fix: 错误默认端口号造成无法TCP Trace

修改部分提示

README.md

@@ -96,7 +96,7 @@ nexttrace -d IP.SB
 ## 另外：由于IP.SB被滥用比较严重，会经常出现无法查询的问题，请知悉。
 ```
 
-`NextTrace`目前不支持自定义参数位置，请按标准格式输入命令
+`NextTrace`支持参数混合使用
 
 ```bash
 Example:
@@ -116,7 +116,7 @@ NextTrace 所有的的 IP 地理位置`API DEMO`可以参考[这里](https://git
 
 ```shell
 Usage of nexttrace:
-      nexttrace [options] <hostname>
+      'nexttrace [options] <hostname>' or 'nexttrace <hostname> [option...]'
 Options:
   -T    Use TCP SYN for tracerouting (default port is 80)
   -U    Use UDP Package for tracerouting (default port is 53 in UDP)

main.go

@@ -18,7 +18,7 @@ import (
 var fSet = flag.NewFlagSet("", flag.ExitOnError)
 var tcpSYNFlag = fSet.Bool("T", false, "Use TCP SYN for tracerouting (default port is 80)")
 var udpPackageFlag = fSet.Bool("U", false, "Use UDP Package for tracerouting (default port is 53 in UDP)")
-var port = fSet.Int("p", -1, "Set SYN Traceroute Port")
+var port = flag.Int("p", 80, "Set SYN Traceroute Port")
 var numMeasurements = fSet.Int("q", 3, "Set the number of probes per each hop.")
 var parallelRequests = fSet.Int("r", 18, "Set ParallelRequests number. It should be 1 when there is a multi-routing.")
 var maxHops = fSet.Int("m", 30, "Set the max number of hops (max TTL to be reached).")
@@ -30,7 +30,7 @@ var tablePrint = fSet.Bool("table", false, "Output trace results as table")
 var ver = fSet.Bool("V", false, "Check Version")
 
 func printArgHelp() {
-	fmt.Println("\nArgs Error\nUsage : 'nexttrace [option...] <hostname>' or 'nexttrace <hostname> [option...]'")
+	fmt.Println("\nArgs Error\nUsage : 'nexttrace [option...] <hostname>' or 'nexttrace <hostname> [option...]'\nOPTIONS: [-VTU] [-d DATAORIGIN.STR ] [ -m TTL ] [ -p PORT ] [ -q PROBES.COUNT ] [ -r PARALLELREQUESTS.COUNT ] [-rdns] [ -realtime | -table ] -report")
 	fSet.PrintDefaults()
 	os.Exit(2)
 }