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jquery date sets current date

王林Original: 2023-05-23 11:58:381085browse

In the development of web applications, it is often necessary to use date pickers, and jQuery is a very popular JavaScript library that also provides a wealth of date picker plug-ins. Before using the plug-in, we can also use jQuery's date operation method to set the current date. Next, this article will introduce how to use jQuery to set the current date.

1. Get the current date and time

In JavaScript, we can use the Date object to get the current date and time, and format the date as needed. In jQuery, you can also use the Date object to obtain the current date and time, and read and modify date and time values through jQuery's selector. The following is a code example for obtaining the current time and date:

//获取当前时间
var now = new Date();
var time = now.getTime();//获取值为从1970年1月1日到当前日期的毫秒数
var formattedTime = now.toLocaleTimeString();//格式化成本地时间格式，例如："上午10:08:30"
var formattedDate = now.toLocaleDateString();//格式化当前日期，例如："2021/10/29"

//获取当前年月日
var year = now.getFullYear();//当前年份，例如：2021
var month = now.getMonth()+1;//当前月份（注意：月份从0开始，因此需要加1），例如：10
var date = now.getDate();//当前日期，例如：29

The above code is the method for obtaining the current time and date. You can adjust it according to your needs.

2. Set the current date

On the basis of obtaining the current time and date, we can use jQuery's selector to obtain the corresponding date input box and set it to the current date. The following is a sample code:

<!DOCTYPE html>
<html>
<head>
    <title>设置当前日期</title>
    <meta charset="utf-8"/>
    <script src="http://cdn.staticfile.org/jquery/1.7.2/jquery.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function() {
            //获取当前日期
            var now = new Date();
            var year = now.getFullYear();
            var month = now.getMonth()+1;
            var date = now.getDate();
            var today = year + '-' + month + '-' + date;

            //设置日期输入框的值为当前日期
            $('#date_input').val(today);
        });
    </script>
</head>
<body>
    <label>请输入日期：</label>
    <input type="text" id="date_input"/>
</body>
</html>

In the above code, through the ready() method of jQuery, the current date is obtained after the page is loaded, and formatted into the form of 'YYYY-MM-DD', and Assign it to the calendar input box.

It should be noted that when setting the value of the date input box, you need to use jQuery's selector to obtain the corresponding input box. Only when the corresponding element is obtained can it be modified.

3. Summary

In this article, we introduced how to use jQuery to get the current date and how to assign it to the date input box. By studying this article, we can learn how to use jQuery to simplify our development work and how to quickly implement date operations.

In actual development, obtaining the current date may not be the most commonly used method. It is more based on business needs to obtain the specified date, and jQuery also provides a wealth of date plug-ins, which can be used to implement complex date operations. Therefore, when using jQuery, you must be familiar with the related methods and plug-ins of date operations, so that you can better cope with various needs.

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JavaScript jquery date 对象选择器

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