Ejemplo 1: cómo tomar valor del cuadro de texto html usando parseint javascript
<!-- 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 -->Ejemplo 2: javascript pareseint
parseInt(string, radix);
console.log(parseInt(' 0xF', 16));
// expected output: 1500
console.log(parseInt('321', 2));
// expected output: 0
console.log(parseInt('321', 10));
// expected output: 321
/*
* @param string Required. The value to parse. If this argument is not
* a string, then it is converted to one using the ToString abstract
* operation. Leading whitespace in this argument is ignored.
*
* radix
* @param radix Optional. An integer between 2 and 36 that represents
* the radix (the base in mathematical numeral systems) of the string.
* Be careful—this does not default to 10!
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt#Description
* for what happens when radix is not provided
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