我们可以在 JavaScript switch 语句中使用 return 语句吗?

javascriptweb developmentobject oriented programming更新于 2025/8/26 22:04:17

如果 JavaScript switch 语句位于函数内部，则可以包含 return 语句。该函数将返回 switch 语句中的值，并且 switch 语句之后的代码将不会被执行。

以下是在 JavaScript switch 语句中使用 return 语句的代码 −

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 {
      font-size: 20px;
      font-weight: 500;
   }
</style>
</head>
<body>
<h1>Return statement in JavaScript switch</h1>
Enter day 1-7<input type="text" class="day" /><button class="Btn">
CHECK
</button>
<div style="color: green;" class="result"></div>
<h3>
Click on the above button to check which day it is
</h3>
<script>
   let dayVal = document.querySelector(".day");
   let resEle = document.querySelector(".result");
   function returnDay(val) {
      switch (val) {
         case 1:
            return "It's monday";
         case 2:
            return "It's tuesday";
         case 3:
            return "It's wednesday";
         case 4:
            return "It's thursday";
         case 5:
            return "It's friday";
         case 6:
            return "It's saturday";
         case 7:
            return "It's sunday";
         default:
            return "Enter a value between 1 - 7";
      }
   }
   document.querySelector(".Btn").addEventListener("click", () => {
      resEle.innerHTML = returnDay(parseInt(dayVal.value));
   });
</script>
</body>
</html>