javascript - 尝试使用 jQuery/JavaScript 构建递归函数

Question

我目前正在尝试构建一个遍历嵌套对象以查找匹配值的函数。我创建了这个自定义代码来检查每个级别的对象。问题是如何多次重复该函数，直到它获取或匹配我要遍历到多个级别的值。

let animalTree = {
    "animals":[
      {
        "species":"Vertebrates", 
        "types": [
            {
                "category": "Fish",
            },
            {
                "category": "Amphibians",
            },
            {
                "category": "Reptiles",
            },
            {
                "category": "Birds",
            },
            {
                "category": "Mammals",
            }
        ]
      }, 
      {
        "species":"Invertebrates", 
      },
      {
        "species":"Annelids", 
      },
      {
        "species":"Molluscs", 
      },
      {
        "species":"Nematodes", 
      },
      {
        "species":"Arthropods", 
      },
    ],
}





let scanTree = () => {

    let matchValue = "Vertebrates";

    for (let i = 0; i < animalTree.length; i++){

        if (animalTree[i].species == matchValue){
            console.log('Found')
        }
    }
}

let jParse = JSON.stringify(animalTree);

scanTree();

Answer 1

不确定您的键名可能是什么，因此使用 Object.values() 提供通用函数 - 如果您只希望键名是物种，请告诉我 - 将简化

let animalTree = {
    "animals":[
      {
        "species":"Vertebrates", 
        "types": [
            {
                "category": "Fish",
            },
            {
                "category": "Amphibians",
            },
            {
                "category": "Reptiles",
            },
            {
                "category": "Birds",
            },
            {
                "category": "Mammals",
            }
        ]
      }, 
      {
        "species":"Invertebrates", 
      },
      {
        "species":"Annelids", 
      },
      {
        "species":"Molluscs", 
      },
      {
        "species":"Nematodes", 
      },
      {
        "species":"Arthropods", 
      },
    ],
}

let matchValue = "Birds";

let scan = (array) => {
  for(let item of array) {      
      for(let value of Object.values(item)){
          if(typeof value === "string" && value === matchValue) {
              return item;
          } else if (Array.isArray(value)) {
             return scan(value);
          }
      }
  }
}


let result = scan(animalTree.animals);
console.log(result);