js如何将多个json结构组成的字符串转换为数组？

'{a: 1}{a: 2}{a: 3}'

[{a: 1}, {a: 2}, {a: 3}]

function parseMultiJson(jsonStr) {
  const jsonArr = [];
  let startIndex = 0;
  let endIndex = 0;
  while (startIndex < jsonStr.length) {
    // 找到一个 JSON 对象的开始位置
    startIndex = jsonStr.indexOf('{', startIndex);
    if (startIndex === -1) {
      break;
    }
    // 找到一个 JSON 对象的结束位置
    let openBrackets = 1;
    endIndex = startIndex + 1;
    while (openBrackets > 0 && endIndex < jsonStr.length) {
      if (jsonStr[endIndex] === '{') {
        openBrackets++;
      } else if (jsonStr[endIndex] === '}') {
        openBrackets--;
      }
      endIndex++;
    }
    // 将该 JSON 对象解析为一个对象，并添加到数组中
    const json = jsonStr.substring(startIndex, endIndex);
    jsonArr.push(JSON.parse(json));
    // 更新下一个 JSON 对象的开始位置
    startIndex = endIndex;
  }
  return jsonArr;
}

const arr = parseMultiJson('{a: 1}{a: 2}{a: 3}')
console.log(arr)	// [{a: 1}, {a: 2}, {a: 3}]

jsonstr = "{'name':'xiaoming','age':'11','lastTime':'2016-07-26','address':'luoyang'}";
jsonArray = eval(jsonstr);

jsonstr2 = "[{'name':'xiaoming','age':'11','lastTime':'2016-07-26','address':'luoyang'},{'name':'xiaoming2','age':'12','lastTime':'2016-07-27','address':'luoyang2'}]";
jsonArray2= eval(jsonstr2);

jsonstr3 = "{'name':'xiaoming','age':'11','lastTime':'2016-07-26','address':{'pro':'henan','city':'luoy'}}";
jsonArray3 = eval('(' + jsonstr3 + ')');

const obj = {name: "John", age: 30};
const jsonString = JSON.stringify(obj);
console.log(jsonString);  // 输出：{"name":"John","age":30}