我使用材料设计flexbox布局,在一个盒子里,我有两个盒子.我在jsfiddle上创建,以澄清我的意思:
我想在这些盒子之间设置一个空间
<div flex layout="row" layout-align="space-between center">
<md-toolbar flex="15">
<h2 class="md-toolbar-tools">
<span>Home</span>
</h2>
</md-toolbar>
<!--How to set space between -->
<md-toolbar>
<h2 class="md-toolbar-tools" layout-align="end center">
<span>Sign Up</span>
<span>Sign In</span>
</h2>
</md-toolbar>
</div>
我正在尝试使用Gradle,文件看起来像:
// Apply the java plugin to add support for Java
apply plugin: 'java'
// In this section you declare where to find the dependencies of your project
repositories {
// Use 'jcenter' for resolving your dependencies.
// You can declare any Maven/Ivy/file repository here.
mavenCentral()
jcenter()
}
jar {
manifest {
attributes 'Main-Class': 'execute.Entry'
}
}
// In this section you declare the dependencies for your production and test code
dependencies {
// The production code uses the SLF4J …我正在努力学习反应式编程,我对订阅这个词感到非常困惑.
什么是反应式编程的订阅？
我知道订阅时会创建订阅者.
我正在学习 akka 流，在代码中遇到了 Keep.left 和 Keep.right：
implicit val system = ActorSystem("KafkaProducer")
implicit val materializer = ActorMaterializer()
val source = Source(List("a", "b", "c"))
val sink = Sink.fold[String, String]("")(_ + _)
val runnable: RunnableGraph[Future[String]] = source.toMat(sink)(Keep.right)
val result: Future[String] = runnable.run()
这里的 Keep.right 是什么意思？
从package.jsonwith安装软件包后yarn，然后启动，yarn test出现以下错误：
FAIL src/Dashboard/AppBar/Tests/AppBar.test.js\n \xe2\x97\x8f Test suite failed to run\n\n TypeError: environment.setup is not a function\n\n at node_modules/jest-runner/build/run_test.js:71:23\n\nTest Suites: 1 failed, 1 total\nTests: 0 total\nSnapshots: 0 total\nTime: 0.478s\nRan all test suites related to changed files.\n当我运行 withnpm i安装软件包，然后运行测试时yarn test，测试将通过。
PASS src/Dashboard/AppBar/Tests/AppBar.test.js\n \xe2\x9c\x93 renders (92ms)\n\nTest Suites: 1 passed, 1 total\nTests: 1 passed, 1 total\nSnapshots: 0 total\nTime: 1.452s, estimated 2s\nRan all test suites related to changed files.\n\nWatch Usage: Press …我正在尝试在我的 vue 应用程序中使用 grpc-web 客户端，如下所示：
import Vue from "vue";
import App from "./App.vue";
const { Registration, _ } = require("./identity-service_pb.js");
const {
IdentityServicePromiseClient
} = require("./identity-service_grpc_web_pb.js");
const identityService = new IdentityServicePromiseClient(
"http://localhost:9000"
);
const req = new Registration();
req.setGender("male");
req.setInterestList(["A", "B", "C"]);
console.log(req);
console.log(identityService);
identityService.signUp(req, {}).then(function(response) {
console.log(response);
}).catch(function(error) {
console.error(error);
});
Vue.config.productionTip = false;
new Vue({
render: h => h(App)
}).$mount("#app");
当应用程序被编译时，编译器会抱怨：
error in ./src/identity-service_pb.js
Module Error (from ./node_modules/eslint-loader/index.js):
/home/developer/js/identity-client/src/identity-service_pb.js
27:1 error 'proto' is not defined no-undef
28:50 error …首先,请查看以下代码段:
package main
import (
"fmt"
)
func main() {
var para1 struct {
email, addr string
}
para1.email = "test@test.com"
if para1 != nil {
fmt.Println(para1)
}
}
当我编译这段代码时,我遇到了编译器错误:
./struct_func.go:15: cannot convert nil to type struct { email string; addr string }
如何判断我的struct变量是否为零？或者我必须验证属性
if para1.email != nil {
fmt.Println(para1)
}
我正在尝试使用regexp编写密码验证功能,但不知道该怎么做.Golang正则表达式与其他语言不同.有人知道,这个正则表达式模式应该如何？
该模式应验证:
/*
* Password rules:
* at least 7 letters
* at least 1 number
* at least 1 upper case
* at least 1 special character
*/
我有以下elixir代码片段:
defmodule Rectangle do
def area(a, b) do
a * b
end
def area(a) do
a * a
end
end
然后我将文件加载到iex会话中,如下所示:
iex(1)> import_file "rectangle.exs"
{:module, Rectangle,
<<70, 79, 82, 49, 0, 0, 5, 84, 66, 69, 65, 77, 69, 120, 68, 99, 0, 0, 0, 204, 131, 104, 2, 100, 0, 14, 101, 108, 105, 120, 105, 114, 95, 100, 111, 99, 115, 95, 118, 49, 108, 0, 0, 0, 4, 104, 2, ...>>,
{:area, 1}}
它像我预期的那样工作得很好
iex(2)> Rectangle.area(9)
81 …我通过终端安装了SBT,命令如下:
echo "deb https://dl.bintray.com/sbt/debian /" | sudo tee -a /etc/apt/sources.list.d/sbt.list
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 2EE0EA64E40A89B84B2DF73499E82A75642AC823
sudo apt-get update
sudo apt-get install sbt
在我的Ubuntu 18.04和java版本:
openjdk version "1.8.0_171"
OpenJDK Runtime Environment (build 1.8.0_171-8u171-b11-0ubuntu0.18.04.1-b11)
OpenJDK 64-Bit Server VM (build 25.171-b11, mixed mode)
安装成功但是当我试图SBT通过终端启动时,我就得到了
https://repo.scala-sbt.org/scalasbt/ivy-snapshots/org.scala-sbt/sbt/1.1.6/ivys/ivy.xml
::::::::::::::::::::::::::::::::::::::::::::::
:: UNRESOLVED DEPENDENCIES ::
::::::::::::::::::::::::::::::::::::::::::::::
:: org.scala-sbt#sbt;1.1.6: not found
::::::::::::::::::::::::::::::::::::::::::::::
:::: ERRORS
Server access Error: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty url=https://repo1.maven.org/maven2/org/scala-sbt/sbt/1.1.6/sbt-1.1.6.pom
Server access Error: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: …