JavaScript Symbol.for() 函数
javascriptweb developmentobject oriented programming
Symbol.for() 函数在运行时范围内的符号寄存器中搜索给定的符号。如果找到该符号，则返回该符号，否则在全局符号寄存器中创建一个新符号并直接返回。
以下是 symbol.for() 函数的代码
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.for() function</h1>
<div class="sample"></div>
<button class="btn">点击此处</button>
<h3>
Click on the above button to get the symbols.
</h3>
<script>
let fillEle = document.querySelector(".sample");
let symbol = [];
symbol.push(Symbol.for("New"));
symbol.push(Symbol.for("Hello"));
symbol.push(Symbol.for(345));
document.querySelector(".Btn").addEventListener("click", () => {
symbol.forEach((item) => (fillEle.innerHTML += item.toString() + "<br>"));
});
</script>
</body>
</html>
输出
点击“CLICK HERE”按钮 −
