Javascript 如何将此字符串转换为数组？

我需要将这个字符串转换成数组，格式如下所示

项目字符串

[{"_id":"1e12345","a":"abc","b":def","c":ghi"},{"_id":"1e678910","a":"xzx","b":sed","c":ert"}]

var item=itemString.split("},{").map(function(i){
    return i
})
console.log(item)

我需要从console.log（项）获取的内容

我从console.log（项）获得的内容

---

你在找吗？太好了-谢谢-正是我想要的-周五快乐

0:{_id:"1e12345",a:"abc",b:"def",c:"ghi"}
1:{_id:"1e678910",a:"xzx",b:"sed",c:"ert"}

0:"[{"_id":"1e12345","a":"abc","b":"def","c":"ghi""
1:""_id":"1e678910","a":"xzx","b":"sed","c":"ert"}]"