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let obj1 = {
  a: {
    b: 1,
  },
};

function deepClone(obj) {
  let cloneObj = Array.isArray(obj) ? [] : {};

  for (let key in obj) {
    //遍历

    if (typeof obj[key] === "object") {
      cloneObj[key] = deepClone(obj[key]); //是对象就再次调用该函数递归
    } else {
      cloneObj[key] = obj[key]; //基本类型的话直接复制值
    }
  }

  return cloneObj;
}

let obj2 = deepClone(obj1);

obj1.a.b = 2;

console.log(obj2); //  {a:{b:1}}

const isComplexDataType = (obj) =>
  (typeof obj === "object" || typeof obj === "function") && obj !== null;

const deepClone = function (obj, hash = new WeakMap()) {
  if (obj.constructor === Date) return new Date(obj); // 日期对象直接返回一个新的日期对象

  if (obj.constructor === RegExp) return new RegExp(obj); //正则对象直接返回一个新的正则对象

  //如果循环引用了就用 weakMap 来解决

  if (hash.has(obj)) return hash.get(obj);

  let allDesc = Object.getOwnPropertyDescriptors(obj);

  //遍历传入参数所有键的特性

  let cloneObj = Object.create(Object.getPrototypeOf(obj), allDesc);

  //继承原型链

  hash.set(obj, cloneObj);

  for (let key of Reflect.ownKeys(obj)) {
    cloneObj[key] =
      isComplexDataType(obj[key]) && typeof obj[key] !== "function"
        ? deepClone(obj[key], hash)
        : obj[key];
  }

  return cloneObj;
};

// 下面是验证代码

let obj = {
  num: 0,

  str: "",

  boolean: true,

  unf: undefined,

  nul: null,

  obj: { name: "我是一个对象", id: 1 },

  arr: [0, 1, 2],

  func: function () {
    console.log("我是一个函数");
  },

  date: new Date(0),

  reg: new RegExp("/我是一个正则/ig"),

  [Symbol("1")]: 1,
};

Object.defineProperty(obj, "innumerable", {
  enumerable: false,
  value: "不可枚举属性",
});

obj = Object.create(obj, Object.getOwnPropertyDescriptors(obj));

obj.loop = obj; // 设置loop成循环引用的属性

let cloneObj = deepClone(obj);

cloneObj.arr.push(4);

console.log("obj", obj);

console.log("cloneObj", cloneObj);

$host        = "host=xxx";
$port        = "port=5432";
$dbname      = "dbname=xxx";
$credentials = "user=postgres password=xxx";

$db = pg_connect( "$host $port $dbname $credentials"  );
if(!$db){
  echo "Error : Unable to open database\n";
} else {
  echo "Opened database successfully\n";
}

$sql =  "SELECT id,encode(picture, 'BASE64') as picture FROM water_flow_pictures_data WHERE id=".$_GET['imgid'];

$ret = pg_query($db, $sql);
if(!$ret){
  echo pg_last_error($db);
  exit;
}
while($row = pg_fetch_row($ret)){
  // 方法一
  echo '<img src="data:image/jpg;base64,' . $row[1] .'"/>';
}

$sql =  "SELECT id,picture FROM water_flow_pictures_data WHERE id=".$_GET['imgid'];

$ret = pg_query($db, $sql);
if(!$ret){
  echo pg_last_error($db);
  exit;
}
while($row = pg_fetch_row($ret)){
  // 方法二
  header("Content-Type: image/jpeg");
  echo pg_unescape_bytea($row[1]);
}

// 获取原图属性
list($width, $height, $type, $attr) = getimagesizefromstring(pg_unescape_bytea($row[1]));
$newWidth = $_GET['width']?$_GET['width']: $width;
$newHeight = $height/$width * $newWidth;

$image =imagecreatefromstring(pg_unescape_bytea($row[1]));
$quality  = 0; // 图片输出质量，0 为最低


// Create a blank image and add some text
$im = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresized($im,$image,0,0,0,0,$newWidth,$newHeight,$width,$height);
// $text_color = imagecolorallocate($im, 233, 14, 91);
// imagestring($im, 1, 5, 5,  'A Simple Text String', $text_color);

// Set the content type header - in this case image/jpeg
header('Content-Type: image/jpeg');

// Output the image
imagejpeg($im, null, $quality);

// Free up memory
imagedestroy($im);

pg_close($db);

# 1. 安装 PSReadline 包，该插件可以让命令行很好用，类似 zsh
Install-Module -Name PSReadLine -AllowPrerelease -Force

# 2. 安装 posh-git 包，让你的 git 更好用
Install-Module posh-git -Scope CurrentUser

# 3. 安装 oh-my-posh 包，让你的命令行更酷炫、优雅
winget install JanDeDobbeleer.OhMyPosh -s winget

#------------------------------- Import Modules BEGIN -------------------------------
# 引入 posh-git
Import-Module posh-git

# 初始化 oh-my-posh 并设置 PowerShell 主题
oh-my-posh init pwsh --config "$env:POSH_THEMES_PATH\paradox.omp.json" | Invoke-Expression
# oh-my-posh init pwsh --config "$env:POSH_THEMES_PATH\jandedobbeleer.omp.json" | Invoke-Expression
#------------------------------- Import Modules END   -------------------------------





#-------------------------------  Set Hot-keys BEGIN  -------------------------------
# 设置 Tab 键补全
# Set-PSReadlineKeyHandler -Key Tab -Function Complete

# 设置 Ctrl+d 为菜单补全和 Intellisense
Set-PSReadLineKeyHandler -Key "Tab" -Function MenuComplete

# 设置 Ctrl+d 为退出 PowerShell
Set-PSReadlineKeyHandler -Key "Ctrl+d" -Function ViExit

# 设置 Ctrl+z 为撤销
Set-PSReadLineKeyHandler -Key "Ctrl+z" -Function Undo

#-------------------------------  Set Hot-keys END    -------------------------------