JavaScript symbol.@@toPrimitive() function

javascriptweb developmentobject oriented programming

The symbol.@@toPrimitive() function converts a symbol object to a primitive value.

语法

Symbol()[Symbol.toPrimitive](hint)

The hint value specifies the type eg − number, string, etc and is an optional argument.

Following is the code for symbol.@@toPrimitive() function −

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.@@toPrimitive() function</h1>
<div class="sample"></div>
<button class="btn">点击此处</button>
<h3>
Click on the above button to add the object with a number.
</h3>
<script>
   let fillEle = document.querySelector(".sample");
   let obj = {
      num: 22,
      [Symbol.toPrimitive]() {
         return this.num;
      },
   };
   document.querySelector(".Btn").addEventListener("click", () => {
      fillEle.innerHTML = obj + 44;
   });
</script>
</body>
</html>