Which code uses the correct JSON syntax for encoding a key/value pair with a null value?( )
"lastVisit": "null"
lastVisit: null
"lastVisit": 0
"lastVisit": undefined
青云测评
青云测评
Which code uses the correct JSON syntax for encoding a key/value pair with a null value?( )
"lastVisit": "null"
lastVisit: null
"lastVisit": 0
"lastVisit": undefined
