Send email using java script

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HTML

Hi I would like to assign the values of my HTML form like
First name
Last Name
Email Address
Message
to the email after clicking the send Email button

I have tried using the below script it joust opens the mail in Outlook but not copying the HTMl data
can I know what I need to add to my script for copying those details to the email when submit the send buton

What I have tried:

function sendEmail()
{
    var link = "mailto:abcd@smtp.com" +
        "&subject=" + escape("This is subject") +
        "&body=" + escape("This is body");
    var name = document.getElementById("First Name")

    window.location.href = link;
}