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法学研究解释 JavaScript switch 语句中的常见代码块？
以下是实现 JavaScript switch 语句中常见代码块的代码 −
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>JavaScript Switch statement</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");
document.querySelector(".Btn").addEventListener("click", () => {
switch (parseInt(dayVal.value)) {
case 1:
resEle.innerHTML = "It's monday";
break;
case 2:
resEle.innerHTML = "It's tuesday";
break;
case 3:
resEle.innerHTML = "It's wednesday";
break;
case 4:
resEle.innerHTML = "It's thursday";
break;
case 5:
resEle.innerHTML = "It's friday";
break;
case 6:
resEle.innerHTML = "It's saturday";
break;
case 7:
resEle.innerHTML = "It's sunday";
break;
default:
resEle.innerHTML = "Enter a value between 1 - 7";
break;
}
});
</script>
</body>
</html>输出
以上代码将产生以下输出 −
输入 1-7 之间的数字并点击检查 −
更新于： 2020-7-15
209 次浏览
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