parseInt(value);
let string = "321"
console.log(string); // "321" <= string
let number = parseInt(string);
console.log(number) // 321 <=int<!-- GET VALUE/INTEGER FROM HTML TEXTBOX/<INPUT> -->
<!-- First set up your input box within the <body> tag -->
<input id="example"> <!-- you are able to set the id to whatever you like,
just make sure it is unique to your page and is
understandable -->
<script> <!-- Use this tag within the body to write javascript in -->
</script>
<!-- Inside the script tag, use parseInt() to grab value and assign it
to a variable to use later -->
<script>
var examplevar = parseInt(document.getElementById("example").value);
</script>
<!-- Make sure to set the identifier/id of the .geteElementBy tag to the id of
the textbox you want to grab the value from, or else it will result in
an error message. -->
<!-- You now have a variable that can be used for math equations in
javascript -->