将Javascript对象转换为数组(顺序很重要)[关闭]

如果要保证顺序,需要在保证顺序的数据结构(如列表)中定义该顺序。

例如,您可以这样做:

let person = {
    f_name: "John",
    l_name: "Doe",
    age: 20
}
let orderedKeys = ["f_name", "l_name", "age"];
let personArray = orderedKeys.map(function (key) {
    return person[key];
});

假设属性总是可枚举的,您可以使用 Object.values()

var person = {
    f_name: "John",
    l_name: "Doe",
    age: 20
}

var vals = Object.values(person);
console.log(vals);

javascript对象没有顺序,您必须用以下方式定义它

var person = {
    f_name: "John",
    l_name: "Doe",
    age: 20
}

var defined_order = ['f_name', 'l_name', 'age'];

let result = [];
for(let prop of defined_order){
    result.push(person[prop]);
}

console.log(result);

所以这实际上不是关于 你的感知

窥视 the lib you're using ,这应该做到:

var columns;
parser.on('header', function(header) {
    columns = header.fields.map(field => field.name);
    console.log("columns", columns);
});

parser.on('record', function(record) {
    var row = columns.map(key => record[key]);
    console.log("row", row);
});

或

parser.on('record', function(record) {
    var row = this.header.fields.map(field => record[field.name]);
    console.log("row", row);
});