La función Continuous.domain() se usa para establecer el dominio de la escala en la array de números especificada. La array especificada aquí contiene dos o más de dos elementos.
Sintaxis:
continuous.domain([domain]);
Parámetros: Esta función acepta un solo parámetro como se mencionó anteriormente y se describe a continuación.
- [dominio]: Esta es una array que toma dos o más valores que especifican el dominio.
Valores devueltos: esta función no devuelve nada.
Los siguientes ejemplos ilustran la función D3.js continuo.dominio() en JavaScript:
Ejemplo 1:
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport"
path1tent="width=device-width,
initial-scale=1.0"/>
<script src=
"https://d3js.org/d3.v4.min.js">
</script>
<script src=
"https://d3js.org/d3-color.v1.min.js">
</script>
<script src=
"https://d3js.org/d3-interpolate.v1.min.js">
</script>
<script src=
"https://d3js.org/d3-scale-chromatic.v1.min.js">
</script>
</head>
<body style="text-align: center;">
<h2 style="color: green;">
Geeksforgeeks
</h2>
<p>D3.js continuous.domain() Function </p>
<script>
var object = d3.scaleLinear()
// Domain ranges 0 to 1
.domain([0, 1])
.range(["red", "green"]);
document.write("<br/>")
document.write("<h4>"+object(0)+"</h4>");
document.write("<h4>"+object(1)+"</h4>");
</script>
</body>
</html>
Producción: 
Ejemplo 2:
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport"
content="width=device-width,
initial-scale=1.0"/>
</head>
<style>
div {
padding: 6px;
text-align: center;
vertical-align: middle;
display: flex;
justify-content: center;
color: White;
width: fit-content;
margin-top: 2px;
height: 20px;
}
</style>
<body>
<h2 style="color: green;">
GeeksforGeeks
</h2>
<p>D3.js continuous.domain()</p>
<div class="box1">
<span>continuous(0.5)</span>
</div>
<div class="box2">
<span>continuous(0.4)</span>
</div>
<div class="box3">
<span>continuous(0.3)</span>
</div>
<div class="box4">
<span>continuous(0.2)</span>
</div>
<div class="box5">
<span>continuous(0.1)</span>
</div>
<!--Fetching from CDN of D3.js -->
<script src=
"https://d3js.org/d3.v4.min.js">
</script>
<script src=
"https://d3js.org/d3-color.v1.min.js">
</script>
<script src=
"https://d3js.org/d3-interpolate.v1.min.js">
</script>
<script src=
"https://d3js.org/d3-scale-chromatic.v1.min.js">
</script>
<script>
var continuous = d3
.scaleLinear()
// Domain ranges 0 to 1
.domain([-2, -1, 0, 1, 2])
.range(["Blue", "green", "orange",
"Red", "black"]);
let color1 = continuous(-2);
let color2 = continuous(-1.5);
let color3 = continuous(0);
let color4 = continuous(1.5);
let color5 = continuous(2);
// Selecting Div using query selector
let box1 = document.querySelector(".box1");
let box2 = document.querySelector(".box2");
let box3 = document.querySelector(".box3");
let box4 = document.querySelector(".box4");
let box5 = document.querySelector(".box5");
// Setting style and BG color of
// the particular DIVs
box1.style.backgroundColor = color1;
box2.style.backgroundColor = color2;
box3.style.backgroundColor = color3;
box4.style.backgroundColor = color4;
box5.style.backgroundColor = color5;
</script>
</body>
</html>
Producción: