Javascript 函数 Object.keys 无法正常工作

Question

Javascript function Object.keys seems to not work correct:

public availableParents: any[] = [];

availableParents[abbreviation] = textField;

the field availableParents is sent to a function.

Then in debug mode I dispay the variable ... and also an Object.keys on the variable :

Immediate window :

?dataSource
[]
    __proto__: []
    ALG: "ALG | Alg"
    length: 0
    SC-1-1: "Scene"

? Object.keys(dataSource)
[SC-1-1,ALG]
    __proto__: []
    length: 2
    [0]: "SC-1-1"
    [1]: "ALG"

I would have expected that Object.keys would return (?) :

[ALG,SC-1-1]
    __proto__: []
    length: 2
    [0]: "ALG"
    [1]: "SC-1-1"

Answer 1

You can't order an object. The keys are stocked in (pseudo-)random order.

If you want to keep track of which key/value you put in first, you better have to use arrays.

If you just want to have an alphabetical order, use sort() method on your Object.keys resulting list

Good luck