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?
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?
as shown in figure
for in is not guaranteed, although it is generally consistent, safe points, use the figure;
Source: in-depth understanding of ES6-
Thekeys 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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