d3.js node.descendants()用法及代码示例

d3.js库中的node.descendants()函数用于生成并返回后代节点数组。

用法:

node.descendants();

参数：该函数不接受任何参数。

返回值：该函数返回一个数组。

下面给出的是上面给出的函数的一些例子。

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> 
        var obj = d3.hierarchy({ 
            name:"rootNode", 
            children:[ 
                { 
                    name:"child1" 
                }, 
                { 
                    name:"child2", 
                    children:[ 
                        { name:"grandChild1" }, 
                    ] 
                }, 
                { 
                    name:"child3", 
                    children:[ 
                        { name:"grandChild5" }, 
                        { name:"grandChild6" }, 
                        { name:"grandChild7" }, 
                        { name:"grandChild8" }, 
                    ] 
                } 
            ] 
        }); 
        // Descendant of child3 
        console.log("Descendant of child3 are:"); 
        console.log(obj.children[2] 
            .descendants()[0].data.name); 
  
        console.log(obj.children[2] 
            .descendants()[1].data.name); 
  
        console.log(obj.children[2] 
            .descendants()[2].data.name); 
  
        console.log(obj.children[2] 
            .descendants()[3].data.name); 
  
        console.log(obj.children[2] 
            .descendants()[4].data.name); 
    </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> 
        var obj = d3.hierarchy({ 
            name:"rootNode", 
            children:[ 
                { 
                    name:"child1" 
                }, 
                { 
                    name:"child2", 
                    children:[ 
                        { name:"grandChild1" }, 
                    ] 
                }, 
                { 
                    name:"child3", 
                    children:[ 
                        { name:"grandChild5" }, 
                        { name:"grandChild6" }, 
                        { name:"grandChild7" }, 
                        { name:"grandChild8" }, 
                    ] 
                } 
            ] 
        }); 
  
        // Descendant of child3 
        console.log("Descendant of child3 are:"); 
        console.log(obj.children[2].descendants()); 
    </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 node.descendants() 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。