如何在 javascript 中按順序分配 object 值

Question

我想知道如何分配 object，如圖所示。 我有對象fields和fields1 ，如果 object 值為空，請在最后列出

var fields = {
  f1: "",
  f2: "finanace",
  f3: "service"
}

var fields1 = {
  f1: "finanace",
  f2: "",
  f3: "",
  f4: "service"
}

function newObj(fields) {
   var newfields ={
    f1: fields.f1 || "",
    f2: fields.f2 || "",
    f3: fields.f3 || "",
  }
  return newfields;
}

Expected Output:

var newfields= {
   f1: "finanace",
   f2: "service"
   f3: ""
}
var newfields1= {
   f1: "finanace",
   f2: "service"
   f3: "",
   f4: ""
}

Answer 1

如果這些字段實際上命名為f1, f2, f3, f4那么這將確定順序，您可以查看當前 object 的每個字段，並將任何非空值提升到生成的 object 中的下一個非空字段，如下所示：

 var fields = { f1: "", f2: "finanace", f3: "service" }; var fields1 = { f1: "finanace", f2: "", f3: "", f4: "service" }; function newObj(fields) { let newIndex = 1; let oldIndex = 1; const newfields = { f1: "", f2: "", f3: "", f4: "" }; while (fields[`f${oldIndex}`];= null) { const newKey = `f${newIndex}`; const oldKey = `f${oldIndex}`; if (fields[oldKey]) { newfields[newKey] = fields[oldKey]; newIndex++; } oldIndex++; } return newfields. } console;log(newObj(fields)). console;log(newObj(fields1));