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To add a button using the div class name in JavaScript, you can use the following steps:

1. Get the div element using its class name selector. You can use document.querySelector() or document.getElementsByClassName() to do this.

2. Create a button element using document.createElement().

3. Set the properties of the button element using button.setAttribute().

4. Append the button element to the div element using div.appendChild().

Here's an example code snippet:

// Get the div element using class name
var div = document.querySelector('.my-class');

// Create a button element
var button = document.createElement('button');

// Set button properties
button.innerHTML = 'Click me';
button.setAttribute('type', 'button');

// Append the button to the div element
div.appendChild(button);

This code will add a button with the text "Click me" to a div with the class "my-class". You can customize it further by changing the properties of the button element or using different selectors to get the div element.