问给定一个json字符串，将嵌套的json字符串转换为键值对，其中键是元素层次结构的名称，并附加“_”

EN

const obj = { "person": { "id": 1, "name": { "first": "John", "middle": "H", "last": "Doe" }, "address": { "home": { "line1": "test address line 1", "line2": "test address line 1" } } } };
const generatePaths = (obj, prefix = "") => {
  let o = {};
  Object.entries(obj).forEach(([k, v]) => {
     const key = prefix ? prefix + '_' + k : k;
     if(typeof v === 'object' && !!v){
        const par = generatePaths(v, key);
        o = {...o, ...par};
     } else {
      o[key] = v;
     }
  });
  return o;
}
console.log(generatePaths(obj));