这是我的代码生成的格式:
[
{
"certifications": [
{
"certificate": "NA",
"completed_on": "2019-09-24T18:30:00.000Z",
"tc_name": "TC-174195"
}
],
"firstname": "Dipak",
"lastname": "Das",
"email": "dasdipak99@gmail.com"
}
]
我想设计如下格式:
[
{
firstname: "Dipak",
lastname: "Das",
email: "dasdipak99@gmail.com",
certifications: [
{
certificate: "NA",
completed_on: "2019-09-24T18:30:00.000Z",
tc_name: "TC-174195"
}
]
}
]
下面是我的代码:
var user = [];
var certificate = {
certifications: []
};
certificate["firstname"] = rows[0].firstname;
certificate["lastname"] = rows[0].lastname;
certificate["email"] = rows[0].email;
for (let i = 0; i < rows.length; ++i) {
certificate.certifications.push({
certificate: rows[i].certification_names,
completed_on: rows[i].completed_on,
tc_name: rows[i].tc_name
});
}
有什么想法如何保持插入顺序吗?我对 javascript 很陌生,如果我没有解释清楚,请道歉。
最佳答案
自 ES6 以来,有人声称该顺序将是
- 第一个数字不断增加
- 按插入顺序排列的键
有这个blog post还有这个Stackoverflow thread .
但是你的台词
var certificate = {
certifications: []
};
将认证
作为第一个属性。所以你需要:
var certificate = {};
certificate["firstname"] = "Albert";
certificate["lastname"] = "Lee";
certificate["email"] = "a@b.com";
certificate["certifications"] = [];
certificate.certifications.push({
certificate: "Java",
completed_on: "2020/01/02",
tc_name: "java2020"
});
console.log(certificate);
为了更好地保证订单,请使用Map
,保持按键的原始插入顺序。通常你可能不需要它,但只是出于某种原因如果你想要顺序,并且可以在 for-of 循环中拥有这样的顺序:
var certificate = new Map();
certificate.set('firstname', "Albert");
certificate.set('lastname', "Lee");
certificate.set('email', "a@b.com");
certificate.set("certifications", []);
certificate.get("certifications").push({
"certificate": "Java",
"completed_on": "2020/01/02",
"tc_name": "java2020"
})
console.log(certificate);
for (e of certificate) console.log(e)
StackOverflow 不会打印任何内容:
console.log(certificate);
使用 Node 或 Chrome,它是:
Map {
'firstname' => 'Albert',
'lastname' => 'Lee',
'email' => 'a@b.com',
'certifications' => [
{
certificate: 'Java',
completed_on: '2020/01/02',
tc_name: 'java2010'
}
]
}
关于javascript - 如何在javascript中保持插入顺序?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59727597/