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// Reference: https://www.cnblogs.com/hejianchun/articles/3108954.html

public class HPBar : MonoBehaviour {
  public GameObject hpBar; // 获取血条信息。
  public GameObject camera; // 获取主摄像机  
  public Vector3 offset; // 血条和人物坐标的差值,也就是血条在人物的上中方...之类的.这样理解
  
  void Update () {
    Vector3 relativePos = transform.position - camera.transform.position;
    Quaternion rotation = Quaternion.LookRotation(relativePos);

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list indicator - l1 - ○

list indicator - l2 - ●

list indicator - l3 - ■

narrow non-break space -  

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Fix Error unable to start ssh-agent service, error: 1058(xxxx)

1. win + R, Go To services.msc

2. Find And Check Is OpenSSH Authentication Agent Service Running

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Fix Can Not Start Mongo Service In Win10

特定错误 100

删除 MongoDB/data/db/mongod.lock 和 MongoDB/data/db/storage.bson

在 services.msc 中检查服务启动内容是否有误, 如果有无则需要删除后重新添加

删除 Service 的方法:

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修复 The system cannot find the path specified/系统无法找到制定路径 的错误

win + R -> 运行 -> regedit -> 编辑注册表

清空 HKEY_CURRENT_USER\Software\Microsoft\Command Processor\AutoRun

清空 HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\AutoRun

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## Reference: https://stackoverflow.com/questions/45585542/detecting-when-user-scrolls-to-bottom-of-div-with-react-js
function isBottom(el) {
  return el.getBoundingClientRect().bottom <= window.innerHeight;
}

function trackScrolling() {
  const wrappedElement = document.querySelector(<target>);
  if (isBottom(wrappedElement)) {
    console.log('header bottom reached');
    document.removeEventListener('scroll', this.trackScrolling);

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var newSequence = originalSequence.Select(x => {translation});
// OR
var newSequence = from x in originalSequence
                  select {translation};

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var list = new List<string> {"A", "B", "C"};
list.Where(x => x != "A")

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rm /etc/apt/sources.list.d/sources-aliyun*
vim /etc/apt/sources.list.d/sources-aliyun-0.list
deb http://mirrors.163.com/debian/ jessie main non-free contrib
deb http://mirrors.163.com/debian/ jessie-updates main non-free contrib
deb http://mirrors.163.com/debian/ jessie-backports main non-free contrib
deb-src http://mirrors.163.com/debian/ jessie main non-free contrib
deb-src http://mirrors.163.com/debian/ jessie-updates main non-free contrib
deb-src http://mirrors.163.com/debian/ jessie-backports main non-free contrib
deb http://mirrors.163.com/debian-security/ jessie/updates main non-free contrib
deb-src http://mirrors.163.com/debian-security/ jessie/updates main non-free contrib

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配置 SSH Config 对不同 Github Repo 使用不同的 Private Key

1. Edit SSH Config

# edit config file
vim ~/.ssh/config
# Add Following
Host repo1
 HostName github.com