小编Ger*_*ens的帖子

不起作用

echo ${REV%%\n*}

确实有效

echo ${REV%%
*}

通过http://tldp.org/LDP/abs/html/parameter-substitution.html阅读后,我仍然无法弄清楚如何使其工作.

为什么我不能将事件监听器添加到文本节点本身而不是p元素？

<p>childNode</p>
...
p.childNodes[0].addEventListener('click',function(){alert('ok')},false)

当我点击childNode时,chrome中没有任何反应

var down=function(a,b){alert(a)}
Array.prototype.sort.call(table.tBodies[0].childNodes,down)
Array.prototype.sort.call([0,1,2,3],down)

为什么我没有收到第一次打电话的提醒？

https://github.com/tarm/serial/blob/master/serial.go#L103

type StopBits byte
type Parity byte

type Config struct {
    Name        string
    Baud        int
    ReadTimeout time.Duration
    Size byte
    Parity Parity
    StopBits StopBits
}

我试图标记命令行并填写配置结构但我无法弄清楚如何从int或字符串转到单个字节？

示例大小7

试着

mysize := "7"
mysize[0]

但是后来tarm/serial告诉我serial.Config中输入错误无效

i, err := strconv.Atoi("7")

编译器抱怨我做不到 i.(byte)

我能使其工作的唯一方法是size: 7在config结构中进行硬编码.

https://play.golang.org/p/JKXKa7Pvjd

我想弄清楚如何使用 bytes.Buffer 测试我的后台函数，其中流中可以有随机 io.EOF？

例子：

package main

import (
    "fmt"
    "io"
    "bytes"
    "time"
)

func main() {
    buffer := new(bytes.Buffer)
    go background(buffer)
    i := 0
    for i < 5 {
        i++
        fmt.Fprintf(buffer, "%d)teststring\n", i)
        time.Sleep(1 * time.Second) // generates a io.EOF

    }
    time.Sleep(1 * time.Second)
}

func background(r io.Reader) {
    buf := make([]byte, 64)
    for {   
        n, err := r.Read(buf)
        if err != nil {
            fmt.Print(err.Error())
            return // removing `return` will result in race condition
        }
        fmt.Print(string(buf[:n]))
    }
} …

当我尝试以下

go test -coverprofile=coverage.out

我得到这个coverage.out:

mode: set
_/Users/gert/Desktop/httx/auth.go:10.66,11.54 1 0
_/Users/gert/Desktop/httx/auth.go:11.54,13.89 2 0
_/Users/gert/Desktop/httx/auth.go:17.3,17.11 1 0
_/Users/gert/Desktop/httx/auth.go:13.89,16.4 2 0
_/Users/gert/Desktop/httx/auth.go:22.42,25.2 2 0
...

但是当我这么做的时候

go tool cover -func=coverage.out

coverage.out似乎没有正确格式化？

cover: can't find "auth.go": cannot find package "_/Users/gert/Desktop/httx/" in any of:                                     
        /usr/local/Cellar/go/1.7.1/libexec/src/_/Users/gert/Desktop/httx (from $GOROOT)                                      
        /Users/gert/go/src/_/Users/gert/Desktop/httx (from $GOPATH)

编辑:注意go test -cover工作.

PASS                                                                                                                         
coverage: 29.7% of statements                                                                                                
ok      _/Users/gert/Desktop/httx       0.015s

我提出的每个解决方案都不是线程保存.

def uuid(cls,db):
    u = hexlify(os.urandom(8)).decode('ascii')
    db.execute('SELECT sid FROM sessions WHERE sid=?',(u,))
    if db.fetch(): u=cls.uuid(db)
    else: db.execute('INSERT INTO sessions (sid) VALUES (?)',(u,))
    return u

main :: IO ()
main = do 
    let a = ("teeeeeeeeeeeeest","teeeeeeeeeeeest")
    b <- app a
    print b

app期望(bytestring,bytestring)不是([char],[char])我该如何转换它？

https://play.golang.org/p/FMKxtVlTL5

为什么default:select语句中的无限循环程序？

package main

import (
    "fmt"
    "strconv"
    "time"
)

var quit chan bool
var counter chan int

func main() {
    counter = make(chan int)
    quit = make(chan bool)
    go func() {
        i := 0
        for {
            i++
            select {
            case <-quit:
                fmt.Println("Bye!")
                return
            case counter <- i:
                fmt.Println("Send! " + strconv.Itoa(i))
            default:
                fmt.Println("Default! " + strconv.Itoa(i))
            }
        }
    }()
    fmt.Println("Receive! " + strconv.Itoa(<-counter))
    fmt.Println("Receive! " + strconv.Itoa(<-counter))
    fmt.Println("Receive! " + strconv.Itoa(<-counter))
    fmt.Println("Receive! " + strconv.Itoa(<-counter))
    fmt.Println("Receive! " …

我在其中制作了一个index.html页面

<script type="module" src="scripts/index.js"></script>

index.js包含

import 'menu';

版本26（Safari 10.2，WebKit 12604.1.12）抱怨

TypeError: Module specifier does not start with "/","./","../"

我究竟做错了什么？

请注意，当我将index.ts编译为index.js时，打字稿不会抱怨

对我来说最糟糕的情况是TypeScript和Safari 10.1想要不同的导入语法，这对我来说将是$％^ ^（＆）（ !!!