javascript - 动态嵌套对象循环js

Question

这是一个我想要循环的 json 对象:

{
  node: 'tree',
 text: 'Main Node',
  childs:[
      {
        node: 'tree',
        text: 'First Child',
        childs:[{
                node: 'tree',
                text: 'first child child'
               }....]
      },{
        node: 'tree',
        text: '2nd Child',
        childs:[{
                node: 'tree',
                text: '2nd child child'
               }...]
      }...]
}

这里是第一种json。但问题是 json 是动态的，子元素会根据不同的条件而变化。所以我想循环遍历 json 并将 leaf: true 添加到最后一个嵌套元素的末尾。 这就是想要的:

{
      node: 'tree',
     text: 'Main Node',
      childs:[
          {
            node: 'tree',
            text: 'First Child',
            childs:[{
                    node: 'tree',
                    text: 'first child child',
                    leaf: true // i want to add this node to every last one
                   }]
          },{
            node: 'tree',
            text: '2nd Child',
            childs:[{
                    node: 'tree',
                    text: '2nd child child',
                    leaf: true
                   }]
          }]
    }

Answer 1

您可以使用递归函数来完成:

let objt = {
    node: 'tree',
    text: 'Main Node',
    childs: [
        {
            node: 'tree',
            text: 'First Child',
            childs: [{
                node: 'tree',
                text: 'Main Node'
            }]
        }, {
            node: 'tree',
            text: '2nd Child',
            childs: [{
                node: 'tree',
                text: '2nd child child'
            }]
        }]
};


function setLeaf(objt) {
    if (!objt.childs) {
        objt.leaf = true;
    } else {
        objt.childs.forEach(child => setLeaf(child))
    }
}

setLeaf(objt);