let schools=[ { id:1, zy:"qd", class:"2301" }, { id:2, zy:"qd", class:"2302" }, { id:3, zy:"java", class:"2301" }, { id:4, zy:"java", class:"2202" }, ]转化为let schools1=[ { id:1, zy:"qd", children:[ { id:11, class:"2301" }, { id:12, class:"2302" } ] }, { id:2, zy:"java", children:[ { id:21, class:"2301" }, { id:22, class:"2202" } ] } ]

你可以使用 JavaScript 的循环和条件语句来实现将 `schools` 数组转换为 `schools1` 数组的格式。下面是一个实现示例：

let schools = [
  {
    id: 1,
    zy: "qd",
    class: "2301"
  },
  {
    id: 2,
    zy: "qd",
    class: "2302"
  },
  {
    id: 3,
    zy: "java",
    class: "2301"
  },
  {
    id: 4,
    zy: "java",
    class: "2202"
  },
];

let schools1 = [];
let tempObj = {};

for (let i = 0; i < schools.length; i++) {
  let currentSchool = schools[i];

  if (!tempObj[currentSchool.zy]) {
    tempObj[currentSchool.zy] = {
      id: currentSchool.id,
      zy: currentSchool.zy,
      children: [
        {
          id: currentSchool.id * 10 + 1,
          class: currentSchool.class
        }
      ]
    };
  } else {
    tempObj[currentSchool.zy].children.push({
      id: currentSchool.id * 10 + tempObj[currentSchool.zy].children.length + 1,
      class: currentSchool.class
    });
  }
}

for (let key in tempObj) {
  schools1.push(tempObj[key]);
}

console.log(schools1);

这段代码会将 `schools` 数组转换为 `schools1` 数组的格式。它首先创建一个临时对象 `tempObj` 来存储转换后的数据。然后使用循环遍历 `schools` 数组，根据 `zy` 属性将学校分类，并将相同分类的学校放入对应的 `children` 数组中。最后，将 `tempObj` 中的值添加到 `schools1` 数组中。

运行代码后，你可以在控制台中查看转换后的 `schools1` 数组。