d3.js band.domain()用法及代码示例

d3.js中的band.domain()函数用于设置音阶域。域中存在的第一个值将映射到范围数组中的第一个波段，依此类推。

用法:

band.domain([domain]);

参数：该函数接受上面给定和下面描述的单个参数。

domain:此参数设置刻度的范围，即最小值和最大值。

返回值：此函数不返回任何内容。

范例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>     
</head>  
  
<body>  
    <script>  
      // Create band scale with domain 
      // and range 
      var band = d3.scaleBand() 
  
      // Setting domain for the scale 
      .domain(["redcolor", "greencolor", 
             "blackcolor", "bluecolor"]); 
  
      console.log("band(redcolor):", 
              band("redcolor")); 
      console.log("band(blackcolor):", 
              band("blackcolor")); 
      console.log("band(greencolor):", 
              band("greencolor")); 
      console.log("band(bluecolor):",  
              band("bluecolor"));                         
    </script>  
</body>  
</html>

输出：

范例2：

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> 
</head>  
  
<body>  
    <script>  
        // Creating the band scale with 
        // specified domain and range. 
        var band = d3.scaleBand() 
  
        // Setting domain for the scale 
                 .domain([10, 20, 30, 40]) 
                 .range([0, 11]); 
  
        console.log("band(10):", band(10)); 
        console.log("band(20):", band(20)); 
        console.log("band(30):", band(30)); 
        console.log("band(40):", band(40)); 
    </script>  
</body>  
</html>

输出：

相关用法

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 band.domain() 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。