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jquery convert mb and kb

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May 12, 2023 am 11:40 AM

With the rapid development of network technology, people often need to deal with the size of files when browsing the web using computers or mobile phones. These file sizes are often expressed in units of KB or MB, such as common pictures, videos, texts, etc. In actual development, we often need to convert these file sizes and display them in the user interface. Therefore, this article will introduce how to use jQuery to convert KB and MB.

1. What are KB and MB?

First of all, we need to understand what KB and MB are. KB and MB are both units of computer storage capacity. KB (Kilobyte), the Chinese name is "kilobyte", 1KB is equal to 1024 bytes, and can store very small files, such as a short text file. And MB (Megabyte), the Chinese name is "megabyte", 1MB is equal to 1024KB, which can store some medium-sized files, such as a high-resolution picture. In short, KB can store small files, while MB can store larger files.

2. How to use jQuery to convert KB and MB values?

Next, we will introduce how to use jQuery to convert the KB and MB values and display them in the user interface.

First, we need to create an HTML page, introduce the jQuery library, and create a div element containing the KB and MB values.

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>jQuery转换KB和MB</title>
  <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
  <div id="filesize">
    <h3 id="文件大小">文件大小</h3>
    <p>KB值：1000</p>
    <p>MB值：2.5</p>
  </div>
</body>
</html>

Next, we need to write jQuery code to get the KB and MB values after the page is loaded, convert them to another unit, and finally display the converted results in the user interface.

$(document).ready(function() {
  // 获取KB值
  var kbValue = parseFloat($('#filesize p:eq(0)').text().split('：')[1]);
  // 获取MB值
  var mbValue = parseFloat($('#filesize p:eq(1)').text().split('：')[1]);
  
  // 将KB值转换为MB值
  var convertedMbValue = parseFloat(kbValue / 1024);
  // 将MB值转换为KB值
  var convertedKbValue = parseFloat(mbValue * 1024);
  
  // 将转换后的值更新到用户界面中
  $('#filesize p:eq(0)').text('KB值：' + convertedKbValue.toFixed(2));
  $('#filesize p:eq(1)').text('MB值：' + convertedMbValue.toFixed(2));
});

In the above code, we first use jQuery's selector to obtain the KB and MB values, and convert these values into JavaScript floating point number types. Next, we mathematically convert the KB and MB values to another unit and use the toFixed method to round the result to two decimal places. Finally, we update the text content of elements in the user interface that contain KB and MB values to display the converted values.

3. Notes

In actual development, we need to pay attention to the following points:

Error handling. If the value entered by the user is not a number, we need to perform error handling to avoid program crashes.
Unit case. In the code, we need to pay attention to the case of the unit, such as KB and kB, etc. are different units.
Capacity accuracy. In computers, file size often needs to be expressed with higher precision, such as GB or TB, and we need to choose according to actual needs.

4. Summary

This article introduces how to use jQuery to convert KB and MB, and display the converted results in the user interface. When we need to deal with file size, this technology can help us convert the unit of file size more conveniently and improve development efficiency. Readers can practice or develop based on the sample code in this article.

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