How do I traverse the properties of an object sequentially in js? How to implement it in code

var data = {
    a:1,
    b:2,
    c:3
}

forlet item in data{
    console.log(item)
}

==>  a  b  c

does this guarantee the order in which a b c is output all the time

if there is no other way?

Javascript
Mar.06,2021

as shown in figure

clipboard.png

The order of

for in is not guaranteed, although it is generally consistent, safe points, use the figure;

Source: in-depth understanding of ES6-

The

keys are mapped through hash, so the order cannot be guaranteed. If you want to do so, you need to put them in the array

. After taking a look at the second floor, the experiment shows that everything else is fine except that the numbers will not be arranged in the order in which they are added.

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