在JSON中附加元素，请勿覆盖

Question

我正在编写JSON并将其添加到文件中

但是我的问题是，附加相同的值并过度使用

执行脚本时，我需要将新值添加到文件中并且不要覆盖

我正试图从文件中读取现有的JSON数组，然后用Javascript附加到它，然后将整个内容写回到文件中

需要帮助，谢谢

var obj = {
 table: []
};

obj.table.push({"executionDate":date,
    "issueID":key,
    "priority":{
    "jira": priority, 
    "computed":score1
    },
    "expectedValue":{
        "jira": expected, 
        "computed":score2
    }
})

var json = JSON.stringify(obj);


fs.writeFile('myjsonfile.json', json, 'utf8', function (err) {
    if (err) console.error(err)
    });

fs.readFile('myjsonfile.json', 'utf8', function readFileCallback(err, data){
    if (err){
        console.log(err);
    } else {
    obj = JSON.parse(data); //now it an object
    obj.table.push({"executionDate":date,
    "issueID":key,
    "priority":{
        "jira": priority, 
        "computed":score1
    },
    "expectedValue":{
        "jira": expected, 
        "computed":score2
        }

    }); //add some data
    json = JSON.stringify(obj); //convert it back to json
    fs.writeFile('myjsonfile.json', json, 'utf8', function (err) {
        if (err) console.error(err)
    }); // write it back 
}});

实际结果：

[{
    "executionDate": 25 / 03 / 2019,
    "issueID": 1,
    "priority": {
        "jira": important,
        "computed": 10
    },
    "expectedValue": {
        "jira": expected,
        "computed": 20
    }
},
{
    "executionDate": 25 / 03 / 2019,
    "issueID": 1,
    "priority": {
        "jira": important,
        "computed": 10
    },
    "expectedValue": {
        "jira": expected,
        "computed": 20
    }
}]

预期结果：

[{
    "executionDate": 25 / 03 / 2019,
    "issueID": 1,
    "priority": {
        "jira": important,
        "computed": 10
    },
    "expectedValue": {
        "jira": expected,
        "computed": 20
    }
},
{
    "executionDate": 26 / 03 / 2019,
    "issueID": 2,
    "priority": {
        "jira": important,
        "computed": 20
    },
    "expectedValue": {
        "jira": expected,
        "computed": 30
    }
}]