javascript - JSON.parse(JSON.stringify(data))

Question

Ask when to use JSON.parse(JSON.stringify(data))

Answer 1

Generally used to deep copy a json object, it can also be used to remove attributes whose values ​​do not have JSON representation (numbers, strings, logical values, arrays, objects, null), that is to say attributes like undefined and function value.

a: {
    age: 1,
    name: undefined,
    time: () => {...}
}
变成：
b: {
    age: 1
}

Answer 2

Objects can be copied

Answer 3

Two usage scenarios:
1. Convert JSON string to JSON object, JS direct attribute reference
2. Clone object