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JS Reference Manual

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JavaScript

JS Array
JS Boolean
JS Klass
JS Date
JS Error
JS Global
JS JSON
JS Map
JS Math
JS Number
JS Promise
JS RegExp
JS Set
JS String
JS 对象
JS 运算符
JS 运算符优先级
JS 语句
JS 类型化数组

Window

Window Object
Window Console
Window History
Window Location
Window Navigator
Window Screen

HTML DOM

HTML Document
HTML Element
HTML Attribute
HTML Event
HTML Event 对象
HTML Collection
HTML NodeList
HTML DOMTokenList
HTML Style

Web API

API Canvas
API Console
API Fetch
API Fullscreen
API Geolocation
API History
API MediaQueryList
API Storage
API Validation
API Web

HTML 对象

<a>
<abbr>
<address>
<area>
<article>
<aside>
<audio>
<b>
<base>
<bdo>
<blockquote>
<body>
<br>
<button>
<canvas>
<caption>
<cite>
<code>
<col>
<colgroup>
<datalist>
<dd>
<del>
<details>
<dfn>
<dialog>
<div>
<dl>
<dt>
<em>
<embed>
<fieldset>
<figcaption>
<figure>
<footer>
<form>
<head>
<header>
<h1> - <h6>
<hr>
<html>
<i>
<iframe>
<img>
<ins>
<input> button
<input> checkbox
<input> color
<input> date
<input> dato
<input> dato og klokkeslæt
<input> e-mail
<input> fil
<input> skjult
<input> billede
<input> måned
<input> tal
<input> kodeord
<input> radio
<input> interval
<input> reset
<input> søg
<input> submit
<input> tekst
<input> tid
<input> url
<input> uge
<kbd>
<label>
<legend>
<li>
<link>
<map>
<mark>
<menu>
<menuitem>
<meta>
<meter>
<nav>
<object>
<ol>
<optgroup>
<option>
<output>
<p>
<param>
<pre>
<progress>
<q>
<s>
<samp>
<script>
<section>
<select>
<small>
<source>
<span>
<strong>
<sub>
<summary>
<sup>
<table>
<tbody>
<td>
<tfoot>
<th>
<thead>
<tr>
<textarea>
<time>
<title>
<track>
<u>
<ul>
<var>
<video>

Andre referencer

CSSStyleDeclaration
JS-typekonvertering

Valgfri kurser

Kursusanbefaling:

CodeW3C.com's urteknus

JavaScript Number constructor egenskab

Forrige side constructor
Næste side EPSILON
Gå tilbage til niveauet over JavaScript Number Reference Manual

Definition og brug

Constructor-eegenskaben returnerer funktionen, der opretter Number-prototypen.

For JavaScript-numre returnerer constructor-eegenskaben:function Number() { [native code] }

Eksempel

let num = 134.5;
let text = num.constructor;

Prøv det selv

Syntaks

number.constructor

Returværdi

function Number() { [native code] }

Browserstøtte

constructor er en funktion af ECMAScript1 (ES1).

Alle browsere understøtter fuldt ES1 (JavaScript 1997):

Chrome	IE	Edge	Firefox	Safari	Opera
Chrome	IE	Edge	Firefox	Safari	Opera
Support	Support	Support	Support	Support	Support

Forrige side constructor
Næste side EPSILON
Gå tilbage til niveauet over JavaScript Number Reference Manual