什么是 JavaScript 类型强制?

javascriptweb developmentobject oriented programming更新于 2025/8/19 8:44:17

类型强制意味着自动或隐式地将一种数据类型转换为另一种数据类型。

以下是 JavaScript 类型强制的代码 −

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;
   }
   .result,.sample {
      font-size: 20px;
      font-weight: 500;
   }
</style>
</head>
<body>
<h1>JavaScript type coercion</h1>
<div class="sample">22</div>
<div style="color: green;" class="result"></div>
<button class="btn">点击此处</button>
<h3>Click on the above button to add the above number with 5.</h3>
<script>
   let sampleEle = document.querySelector('.sample');
   let resEle = document.querySelector(".result");
   document.querySelector(".Btn").addEventListener("click", () => {
      resEle.innerHTML = ' "22" + 5 = ' + sampleEle.innerHTML+5;
   });
</script>
</body>
</html>