如何使用 HTML 和 JavaScript 创建速度转换器?

javascriptweb developmentobject oriented programming更新于 2025/12/19 9:16:17

使用 HTML 和 JavaScript 创建速度转换器，代码如下 −

示例

<!DOCTYPE html>
<html>
<head>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   input, span {
      font-size: 20px;
   }
</style>
</head>
<body>
<h1>Speed Converter</h1>
<h2>Type speed in Kilometer per hour to convert it into meter per hour</h2>
<p>
<label>Kilometer Per Hour</label>
<input
id="inputKm"
type="number"
placeholder="KilometersPerHour"
oninput="KmphtoMphConverter(this.value)"
onchange="KmphtoMphConverter(this.value)"/>
</p>
<p>Meters Per second: <span class="metersPerSecond"></span></p>
<script>
   function KmphtoMphConverter(speed) {
      document.querySelector(".metersPerSecond").innerHTML = speed * 0.277778;
   }
</script>
</body>
</html>