generate a web form that stores first name, last name, phone number, and address in javascript

To generate a web form that stores first name, last name, phone number, and address using JavaScript you would need to create a HTML form and handle the form submission using JavaScript.

Here's an example HTML form that you can use as a starting point:

<form id="myForm">
  <label>First Name:</label>
  <input type="text" name="firstName"/><br>
  <label>Last Name:</label>
  <input type="text" name="lastName"/><br>
  <label>Phone Number:</label>
  <input type="text" name="phoneNumber"/><br>
  <label>Address:</label>
  <input type="text" name="address"/><br>
  <button type="submit">Submit</button>
</form>
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Next, you'll need to add a JavaScript function to handle the form submission and store the form data.

index.tsx
const form = document.getElementById("myForm");
form.addEventListener("submit", function(event) {
  event.preventDefault();
  
  const formData = new FormData(event.target);
  const data = {};
  formData.forEach((value, key) => data[key] = value);
  
  // Do something with data
  console.log(data);
});
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The JavaScript code above attaches an event listener to the form's submit event, preventing the default form submission behavior. It then creates a new FormData object from the form data and converts it into a JavaScript object. You can then use this data to store it in a database or use it to update the UI of your web page.

This is just a simple example to get you started. You can modify the HTML form and JavaScript code based on your specific needs.