How to use prompt in js

In JavaScript, the prompt() method displays a dialog box in the browser, allowing the user to enter text. Usage: let input = prompt(message[, default]), where message is the prompt message and default is the optional default value. This method returns the text entered by the user, or null if no input was entered. Tip: When using this method, keep your message concise and validate user input.

Using the prompt() method in JavaScript

What is it?
The prompt() method displays a dialog box in the browser, allowing the user to enter text.

Usage:

<code class="js">let input = prompt(message[, default]);</code>

Parameters:

• message: To be displayed to the user prompt message.
• default (optional): The default value displayed in the input field.

Return value:

• The text entered by the user, or null if there is no input.

Example:

<code class="js">// 显示提示消息并获取用户输入
let name = prompt("请输入您的姓名：");</code>

Prompt:

• prompt() method is synchronous, this Meaning it blocks script execution until the user closes the dialog box or presses the Enter key.
• The user can click the Cancel button in the dialog box or press the Esc key to close the dialog box, in which case null will be returned.
• When using the prompt() method, make sure the message is clear and concise.
• Verify the validity of user input, such as using regular expressions or other validation methods.
• Do not use the prompt() method to collect sensitive information because it is not secure.

The above is the detailed content of How to use prompt in js. For more information, please follow other related articles on the PHP Chinese website!