chromedp自动启动为headless模式

 // Command click is a chromedp example demonstrating how to use a selector to
 // click on an element.
 package main

 import (
     "context"
     "fmt"
     "github.com/chromedp/cdproto/page"
     "github.com/chromedp/chromedp"
     "github.com/chromedp/chromedp/runner"
     "log"
     "os"
     "time"
 )

 func main() {
     var err error

     // create context
     ctxt, cancel := context.WithCancel(context.Background())
     defer cancel()

     // create chrome instance
     //c, err := chromedp.New(ctxt, chromedp.WithLog(log.Printf))
     //if err != nil {
     //    log.Fatal(err)
     //}

     c, err := NewHeadless(ctxt, `https://xxx.xx`)
     if err != nil {
         log.Fatalf("new headless: %s",err)
     }

     // run task list
     err = c.Run(ctxt, click())
     if err != nil {
         log.Fatalf("task err: %s",err)
     }

     // shutdown chrome
     err = c.Shutdown(ctxt)
     if err != nil {
         log.Fatalf("shutdown err: %s",err)
     }

     // wait for chrome to finish
     err = c.Wait()
     if err != nil {
         log.Fatalf("wait err: %s",err)
     }
 }

 func click() chromedp.Tasks {
     //url := `https://free-ss.site`
     //sect := "div.main > div > table > tbody >tr:nth-child(2) > td:nth-child(9) > a"
     sect := `//a[@href="v/443.json"]`
     wd,_ := os.Getwd()
     fmt.Println(wd)
     return chromedp.Tasks{
         //chromedp.Navigate(url),
         chromedp.WaitVisible(sect),
         page.SetDownloadBehavior(page.SetDownloadBehaviorBehaviorAllow).WithDownloadPath(wd),
         chromedp.Click(sect, chromedp.NodeVisible),
         chromedp.Sleep( * time.Second),
     }
 }

 // NewHeadless 创建headless chrome实例
 func NewHeadless(ctx context.Context, starturl string) (*chromedp.CDP, error) {
     // runner.Flag设置启动headless chrome时的命令行参数
     // Windows用户需要设置runner.Flag("disable-gpu", true)，具体信息参见文档的FAQ
     run, err := runner.New(runner.Flag("headless", false),runner.StartURL(starturl))

     if err != nil {
         return nil, err
     }

     // run.Start启动实例
     err = run.Start(ctx)
     if err != nil {
         return nil, err
     }

     // 默认情况chromedp会输出大量log，因为是示例所以选择屏蔽，dropChromeLogs为自定义函数，形式为func(string, ...interface{}){}
     // 使用runner初始化chromedp实例
     // 实例在使用完毕后需要调用c.Shutdown()来释放资源
     //c, err := chromedp.New(ctx, chromedp.WithRunner(run), chromedp.WithErrorf(dropChromeLogs))
     c, err := chromedp.New(ctx, chromedp.WithRunner(run), chromedp.WithLog(log.Printf))
     if err != nil {
         return nil, err
     }

     return c, nil
 }