d3.js中的d3.schemeRdBu []函数用于返回十六进制代码中的颜色。该方案是D3.js中多样化颜色方案的一部分。这样就给出了红色和蓝色十六进制代码颜色范围内的颜色。
用法:
d3.schemeRdBu[k];
参数：该函数接受如上所述和以下描述的单个参数：
- t:它是十六进制代码的任何数字或索引。
返回值：它返回该颜色的十六进制颜色代码。
以下示例说明了JavaScript中的D3.js schemeRdBu []函数：
范例1：
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta
name="viewport"
content="width=device-width,
initial-scale=1.0"/>
<title>D3.js schemeRdBu[] Function</title>
</head>
<style></style>
<body>
<!--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>
console.log(d3.schemeRdBu[3][0]);
console.log(d3.schemeRdBu[3][1]);
console.log(d3.schemeRdBu[11][0]);
console.log(d3.schemeRdBu[11][1]);
console.log(d3.schemeRdBu[11][2]);
console.log(d3.schemeRdBu[11][3]);
</script>
</body>
</html>输出：
范例2：
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta
name="viewport"
content="width=device-width,
initial-scale=1.0"/>
<title>D3.js schemeRdBu[] Function</title>
</head>
<style>
div {
padding:5px;
text-align:center;
vertical-align:middle;
display:flex;
justify-content:center;
width:fit-content;
height:50px;
float:left;
}
</style>
<body>
<h2>D3.schemeRdBu()</h2>
<div class="box1">
<span>
(0.1)
</span>
</div>
<div class="box2">
<span>
(0.2)
</span>
</div>
<div class="box3">
<span>
(0.3)
</span>
</div>
<div class="box4">
<span>
(0.4)
</span>
</div>
<div class="box5">
<span>
(0.5)
</span>
</div>
<div class="b6">
<span>
(0.6)
</span>
</div>
<div class="b7">
<span>
(0.7)
</span>
</div>
<div class="b8">
<span>
(0.8)
</span>
</div>
<div class="b9">
<span>
(0.9)
</span>
</div>
<div class="b10">
<span style="color:honeydew;">
(1.0)
</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>
// Creating different colors for
// different values in a array
let color1 = d3.schemeRdBu[3][0];
let color2 = d3.schemeRdBu[3][1];
let color3 = d3.schemeRdBu[3][2];
let color4 = d3.schemeRdBu[4][3];
let color5 = d3.schemeRdBu[10][5];
let color6 = d3.schemeRdBu[8][5];
let color7 = d3.schemeRdBu[10][2];
let color8 = d3.schemeRdBu[11][5];
let color9 = d3.schemeRdBu[11][1];
let color10 = d3.schemeRdBu[11][0];
// 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");
let b6 = document.querySelector(".b6");
let b7 = document.querySelector(".b7");
let b8 = document.querySelector(".b8");
let b9 = document.querySelector(".b9");
let b10 = document.querySelector(".b10");
// 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;
b6.style.backgroundColor = color6;
b7.style.backgroundColor = color7;
b8.style.backgroundColor = color8;
b9.style.backgroundColor = color9;
b10.style.backgroundColor = color10;
</script>
</body>
</html>输出：
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注：本文由纯净天空筛选整理自tarun007大神的英文原创作品 D3.js schemeRdBu[] Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。