Content API

num()

Sets or gets the numeric content of the matched DOM elements and their descendants.

Accepts an argument as a string or a number.
Cannot read styles or retrieve CSS, returns the contents of hidden elements and the contents of "<script>" and "<style>" tags.
If no arguments are passed, it returns a number for a single matched DOM element or an array of numbers for multiple matched DOM elements.
If the value cannot be parsed as a number, NaN will be returned.

Example:

$('div ?').num(10);
// <div>10</div>
// <div>10</div>
// <div>10</div>

$('div').num(10);
// <div>10</div>
// <div>The content is unchanged.</div>
// <div>The content is unchanged.</div>

$('div').num();
// 10

$('div ?').num();
// [10, NaN, NaN]

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