javascript - 不使用 Object.entries() 返回键值对数组的数组

Question

我正在尝试编写一个函数，它接受一个对象并返回一个键值对数组的数组。我也无法使用 Object.entries() 函数。

示例:对于 var obj = { a: 1, b: 2, c: 3 }; 我想返回:[["a",1], ["b",2], ["c",3]]

这是我到目前为止所写的内容:

function entries(obj) {

var result = Object.keys(obj).map(function(key) {
  return [Number(key), obj[key]];
});
}
console.log(
  entries(obj = {"1":5,"2":7,"3":0,"4":0,"5":0,"6":0,"7":0,"8":0,"9":0,"10":0,"11":0,"12":0})
  );

但是，此时我只能让它返回 undefined。我到底做错了什么？

Answer 1

你可以做一个简单的for循环

var obj= {"1":5,"2":7,"3":0,"4":0,"5":0,"6":0,"7":0,"8":0,"9":0,"10":0,"11":0,"12":0}
var arr=[]
for(var item in obj){
  arr.push([item,obj[item]])
}
console.log(arr)