从 object 中获取所有 children 个名字

get all children names from object

如何从 object 中获取所有名称?

var familyTree = {name: 'Alex',
    children:[
        {name: 'Ricky', 
            children:'[...]'}
        {name: 'John', 
            children:[{name: 'Tom', 
                children: '[...]'}]}]};

它会处决 Alex Ricky John Tom。

您可以编写一个简单的递归函数来遍历树的内容:

var familyTree = {
    name: 'Alex',
    children: [
        {
            name: 'Ricky',
            children: [ ]
        },
        {
            name: 'John',
            children: [
                {
                    name: 'Tom',
                    children: [ ]
                }
            ]
        }
    ]
};

var traverse = function(tree) {
    console.log(tree.name);
    for (var i = 0; i < tree.children.length; i++) {
        traverse(tree.children[i]);    
    }
};

traverse(familyTree);

对于更灵活的情况,你想要 return 一个数组而不是仅仅记录到控制台,这里是另一种递归累积数组的方法,深度优先遍历和参数传递:

function storeNames(tree, names) {
  (names = names || []).push(tree.name);
  for(var i = 0; i < tree.children.length; i++) {
    storeNames(tree.children[i], names);
  }
  return names;
}

这是另一种以函数式风格编写的方法:

function storeNames(tree) {
  return Array.prototype.concat(tree.name,
    tree.children.map(function(child) {
      return storeNames(child);
    }).reduce(function(flattenedArr, nestedArr) {
      return flattenedArr.concat(nestedArr);
    })
  );
}