小编agr*_*riz的帖子

main.go:5:2: 包greetings不在GOROOT中 (C:\Program Files\Go\src\greetings)

我正在阅读 Head First go ，它是为了在 c:/users/username/go/src/packagename 和 c:/users/username/go/src/project_name 中创建文件夹而编写的

当我尝试跑步时

go run main.go从project_name文件夹中，我收到以下错误。 main.go:5:2: package greetings is not in GOROOT (C:\Program Files\Go\src\greetings)

C:\Users\agriz>go env
set GO111MODULE=on
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\agriz\AppData\Local\go-build
set GOENV=C:\Users\agriz\AppData\Roaming\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\agriz\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\agriz\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Program Files\Go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.16.7
set GCCGO=gccgo
set …

QuerySnapshot querySnapshot = await _collectionRef   
                                  .limit(1)
                                  .orderBy('date')                                                                    
                                  .getDocuments();
var list = querySnapshot.documents;

querySnapshot.documents.map((document) { 
    print('Document : $document'); // not printing anything.
  });

if(list.length > 0) {
   print('ID : ${list[0].documentID}'); // not working
}

这是我试过的确切代码......代码中有什么错误？

https://www.facebook.com/photo.php?fbid=189943774416975&set=a.189943724416980.45350.135612266516793&type=3&theater

在这里你可以看到他们已经在相册中上传了一张照片,然后有一些GIF动画.

我怎样才能做到这一点？

谢谢

我在webview上面添加了进度条.每当我点击链接时,我只是将进度条显示为可见.

我想在webview上有进度条覆盖,我想显示进度条的百分比.我知道css,但我不知道如何改变android中进度条的位置

<?xml version="1.0" encoding="utf-8"?>
<WebView  xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/webview01"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
/> 

MainActivity.java

public class MainActivity extends Activity {

WebView web;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    web = (WebView) findViewById(R.id.webview01);
 // request the progress-bar feature for the activity
    getWindow().requestFeature(Window.FEATURE_PROGRESS);

    // set a webChromeClient to track progress    
    web.setWebChromeClient(new WebChromeClient()
    {
        public void onProgressChanged(WebView view, int progress)
        {
            // update the progressBar
            MainActivity.this.setProgress(progress * 100);
        }
    });


    web.getSettings().setJavaScriptEnabled(true);
    web.loadUrl("url");

}

// To handle "Back" key press event for WebView to …

$result = reduce($number);

function reduce($number) {
    $new_number = 0;
    if($number < 10) {
        return $number;
    }           

    $q = floor($number / 10 );
    $r = $number % 10;
    $new_number = $q + $r;

    if($new_number <= 9) {          
        return $new_number;         
    }
    else {
        reduce($new_number);
    }
}

我想按数字求和
例如，如果我通过了 10，它应该返回 1+0 = 1
如果我通过了 10，则这有效
，但当我通过 100 时，则不起作用。