var date = Object.keys(data);
Object.keys () returns an array, the array is a list of key value of this object
So long Object.keys (a) [0], can comprise only key values have a key-value pairs
var date = Object.keys(data);
Object.keys () returns an array, the array is a list of key value of this object
So long Object.keys (a) [0], can comprise only key values have a key-value pairs