JavaScript Symbol.keyFor() 函式

JavaScript Symbol.iskeyFor() 用於查詢與給定符號關聯的鍵。鍵是從全域性符號登錄檔中檢索的。

以下是 Symbol.keyFor() 函式的程式碼 −

示例

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   div {
      font-size: 20px;
      font-weight: 500;
   }
</style>
</head>
<body>
<h1>JavaScript Symbol.keyFor() function</h1>
<div class="sample"></div>
<button class="Btn">CLICK HERE</button>
<h3>
Click on the above button to find the keys for the symbol
</h3>
<script>
   let fillEle = document.querySelector(".sample");
   const symbol = Symbol.for("HELLO");
   const symbol1 = Symbol.for("NEW");
   const symbol2 = Symbol.for(711);
   document.querySelector(".Btn").addEventListener("click", () => {
      fillEle.innerHTML += "symbol = " + Symbol.keyFor(symbol) + "<br>";
      fillEle.innerHTML += "symbol1 = " + Symbol.keyFor(symbol1) + "<br>";
      fillEle.innerHTML += "symbol2 = " + Symbol.keyFor(symbol2) + "<br>";
   });
</script>
</body>
</html>