[TOC] ### 訪問網站并且截圖 ``` package main import ( "context" "io/ioutil" "log" "math" "time" "github.com/chromedp/cdproto/emulation" "github.com/chromedp/cdproto/page" "github.com/chromedp/chromedp" ) func main() { // 禁用chrome headless opts := append(chromedp.DefaultExecAllocatorOptions[:], chromedp.Flag("headless", false), ) allocCtx, cancel := chromedp.NewExecAllocator(context.Background(), opts...) defer cancel() // create chrome instance ctx, cancel := chromedp.NewContext( allocCtx, chromedp.WithLogf(log.Printf), ) defer cancel() // create a timeout ctx, cancel = context.WithTimeout(ctx, 15*time.Second) defer cancel() // navigate to a page, wait for an element, click // capture screenshot of an element var buf []byte // capture entire browser viewport, returning png with quality=90 if err := chromedp.Run(ctx, fullScreenshot(`https://github.com/awake1t`, 90, &buf)); err != nil { log.Fatal(err) } if err := ioutil.WriteFile("./Screenshot.png", buf, 0644); err != nil { log.Fatal(err) } log.Println("圖片寫入完成") } // fullScreenshot takes a screenshot of the entire browser viewport. // Liberally copied from puppeteer's source. // Note: this will override the viewport emulation settings. func fullScreenshot(urlstr string, quality int64, res *[]byte) chromedp.Tasks { return chromedp.Tasks{ chromedp.Navigate(urlstr), chromedp.ActionFunc(func(ctx context.Context) error { // get layout metrics _, _, contentSize, err := page.GetLayoutMetrics().Do(ctx) if err != nil { return err } width, height := int64(math.Ceil(contentSize.Width)), int64(math.Ceil(contentSize.Height)) // force viewport emulation err = emulation.SetDeviceMetricsOverride(width, height, 1, false). WithScreenOrientation(&emulation.ScreenOrientation{ Type: emulation.OrientationTypePortraitPrimary, Angle: 0, }). Do(ctx) if err != nil { return err } // capture screenshot *res, err = page.CaptureScreenshot(). WithQuality(quality). WithClip(&page.Viewport{ X: contentSize.X, Y: contentSize.Y, Width: contentSize.Width, Height: contentSize.Height, Scale: 1, }).Do(ctx) if err != nil { return err } return nil }), } } ```