(Personally, this answer is totally a mess :rage::rage::rage:, I may rewrite it some day…:disappointed_relieved::sob:)

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In mathematics, the Fibonacci numbers are the numbers in the following integer sequence, called the Fibonacci sequence:

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, …

By definition, the first two numbers in the Fibonacci sequence are either 1 and 1, or 0 and 1, depending on the chosen starting point of the sequence, and each subsequent number is the sum of the previous two.

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var

Scope

As we all know, there isn’t block-level scope but function-level scope in JavaScript.

For example:

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var scope = 'outer scope'
{
  var scope = 'inner scope'
  console.log(scope) // inner scope
}
console.log(scope) // inner scope
function foo() {
  var scope = 'function scope';
  console.log(scope) // function scope
}
foo()
console.log(scope) // inner scope

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Both of them are the optional values of enctype where the <form> element specifies the content type used to encode the form data set for submission to the server. There are three choices:

1. application/x-www-form-urlencoded (default)
2. multipart/form-data
3. text/plain

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Cookie

HTTP is a stateless protocol, but there are many situations where we need to get stateful infomation…Cookies were designed for this to be a reliable mechanism for websibites to remember stateful information.

A cookie is a small piece of data sent from a website and stored in the user’s web browser while the user is browsing.

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The async and defer are boolean attributes introduced in HTML5 of <script>.

Behavior

neither

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<script type="text/javascript" src="where.js"></script>

Once the HTML parser meets a <script>, the parser will stop parsing HTML and send a request to get the file (if it’s external). Then, the JavaScript engine will execute the script. After the script’s execution finished, the parser will continue parsing the HTML.

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