Why can’t I access object properties in a for-in l

问题:

This question already has answers here:

What is the difference between ( for… in ) and ( for… of ) statements in JavaScript? (12 answers)

Closed 2 years ago.

I am currently utilizing the SheetSU API to read data from a Google Sheets file.

var members = Sheetsu.read("URL", {}, successFunc);

For now, the successFunc is a function that takes the input data to console.log() to me.

The data imports like this: (14){{..},{..},{..}....} and each object within this dictionary looks something like this:

0: {Name: "First Last", ID: "12536723", Status: "Member"}
1: {Name: "First Last", ID: "12371238", Status: "Member"}
...
14: {Name: "First Last", ID: "12341228", Status: "Member"}

I need to pull out the values of Name and ID, however:

for (var x in data) {
    console.log(x)
}

= 0, 1, 2, ..., 14 (as ints not objects)

for (var x in data) {
    console.log(x.Name)
}

= undefined, undefined, ..., undefined

回答1:

x is not a value It is a index like 0,1 ...14, you can use of for that or use data[x] inside in.

var data = [{
        Name: "First Last",
        ID: "12536723",
        Status: "Member"
    }, {
        Name: "First Last",
        ID: "12371238",
        Status: "Member"
    },
    {
        Name: "First Last",
        ID: "12341228",
        Status: "Member"
    }
]

for (var x in data) {

    console.log(data[x].Name); //x is not a value It is a index like 0,1 ...14

}

for (var x of data) {

    console.log(x.Name); // use of which prints x as object not index

}