Get the attribute key of the json object in js

1. Use   of Object.keys

Array of keys in the output object whose value is greater than 2

var data = {a: 1, b: 2, c: 3, d: 4};

Object.keys(data).filter(function(x) { return  1 ;})

Expected output: ["c","d"]

Please fill in what ?

 

Correct answer: 1  : data[x]>2

This is a new syntax for Es5.

const keys = Object. keys (options);   //Only get the attribute key of the json object, and return an array that stores all the keys.