undefined
[ Type ]
A variable that has not yet been assigned a value has the value undefined. Functions that do not have a return value also return undefined.
 | Defined in ECMAScript 1, supported by all JavaScript-enabled browsers |
[ Type ]
A variable that has not yet been assigned a value has the value undefined. Functions that do not have a return value also return undefined.
| Defined in ECMAScript 1, supported by all JavaScript-enabled browsers |