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Writing conversion temperature in javascript

PHPzOriginal: 2023-05-26 17:21:091035browse

In daily life, we often need to convert Celsius to Fahrenheit. This functionality can be easily achieved by writing code using JavaScript. In this article, we'll explore how to write a simple temperature conversion program using JavaScript.

Step 1: HTML page

First, we need to create an HTML page so that users can perform conversions by entering temperature values. The following is the HTML code:

<!DOCTYPE html>
<html>
<head>
    <title>温度转换器</title>
</head>
<body>
    <h1>温度转换器</h1>
    <form>
        <label>输入要转换的温度：</label>
        <input type="text" id="temperature">
        <br><br>
        <input type="radio" name="converter" value="celsius">摄氏度转华氏度
        <input type="radio" name="converter" value="fahrenheit">华氏度转摄氏度
        <br><br>
        <input type="button" value="转换" onclick="convertTemperature()">
    </form>
    <br>
    <p id="result"></p>
</body>
</html>

The above code includes: a title and a form, including an input box, a radio button and a "Convert" button. We've also added a paragraph below the page to display the converted results.

Step 2: JavaScript function

Next, we need to write a JavaScript function to perform temperature conversion when the user clicks the "Convert" button. The following is the JavaScript code:

function convertTemperature() {
    var input = document.getElementById("temperature");
    var temperature = input.value;
    var radio = document.getElementsByName("converter");
    var result = document.getElementById("result");

    if (radio[0].checked) {
        var fahrenheit = (temperature * 9 / 5) + 32;
        result.innerHTML = temperature + " 摄氏度 = " + fahrenheit + " 华氏度";
    } else {
        var celsius = (temperature - 32) * 5 / 9;
        result.innerHTML = temperature + " 华氏度 = " + celsius + " 摄氏度";
    }
}

The above code uses the getElementById, getElementsByName and innerHTML functions to obtain the temperature value entered by the user, obtain the conversion type selected by the user and display the conversion result.

If the user selects "Celsius to Fahrenheit", the program will replace the data type Number type and assign it to the variable temperature, then multiply the input value by 9/5 and add 32 to calculate the corresponding Fahrenheit, and finally output the conversion result.

On the contrary, if the user selects "Fahrenheit to Celsius", the program will also replace the data type Number with the value and assign it to the variable temperature, then subtract 32 from it and multiply it by 5/9 to calculate Output the corresponding degrees Celsius and also output the conversion result.

Step 3: Run the program

Finally, run the program in your browser and you should see a simple temperature converter, easily convert to degrees Celsius after viewing the temperature conversion results Fahrenheit or Fahrenheit to Celsius. Ensure that the JavaScript code is correct and follows the Document Object Model (DOM) to obtain and process temperature values, conversion types, and output results.

Summary:

Through the above simple steps, we can write a very practical JavaScript temperature converter. Although this program is simple, it is highly extensible and can implement more functions to meet your different needs, such as adding unit selections, supporting more temperature regimes, etc. This also illustrates the powerful utility of JavaScript as a general-purpose scripting language.

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