d3.js band.rangeRound()用法及代码示例

band.rangeRound()函数用于将小数位数的范围设置为指定的两个元素的数组，并将此范围也设置为true。

用法:

band.rangeRound([range])

参数：此函数接受上面给定和下面描述的单个参数：

range:此参数接受一个包含两个元素的数字数组。

返回值：此函数不返回任何内容。

下面给出的是上面给出的函数的一些例子。

范例1：

<!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() 
                    .domain([10, 20, 30, 40, 50]) 
                    .range([0, 1]); 
  
        console.log("Without rangeRound function:"); 
        console.log("band(10):", band(10)); 
        console.log("band(20):", band(20)); 
        
        console.log("With rangeRound function:"); 
        
        var band = d3.scaleBand() 
                    .domain([10, 20, 30, 40, 50]) 
                    .rangeRound([0, 1]); 
        
        console.log("band(10):", band(10)); 
        console.log("band(20):", band(20)); 
    </script>  
</body>  
</html>

输出：

范例2：

<!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() 
                    .domain([1, 2, 3, 4]) 
        // When range is in string 
                    .range(["0", "10"]); 
        console.log("Without rangeRound function:"); 
        console.log("band(1):", band(1)); 
        console.log("band(2):", band(2)); 
        
        console.log("With rangeRound function:"); 
        
        var band = d3.scaleBand() 
                    .domain([1, 2, 3, 4, 5]) 
                    .rangeRound(["0", "10"]); 
        
        console.log("band(1):", band(1)); 
        console.log("band(2):", band(2)); 
    </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.rangeRound() 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。