按类型查找对象属性

// 定义一个包含不同类型属性的对象
var obj = {
  name: "John",
  age: 25,
  address: "123 Main St",
  isStudent: true
};

// 按类型查找对象属性
function findPropertiesByType(obj, type) {
  var result = [];

  // 遍历对象的属性
  for (var prop in obj) {
    // 检查属性值的类型是否匹配指定类型
    if (typeof obj[prop] === type) {
      result.push(prop);
    }
  }

  return result;
}

// 调用按类型查找对象属性的函数
var stringProperties = findPropertiesByType(obj, "string");
console.log("String properties:", stringProperties);

var numberProperties = findPropertiesByType(obj, "number");
console.log("Number properties:", numberProperties);

var booleanProperties = findPropertiesByType(obj, "boolean");
console.log("Boolean properties:", booleanProperties);