src code
Ajax.Response#readyState → Number
A Number corresponding to the request's current state.
Number
0 : "Uninitialized" 1 : "Loading" 2 : "Loaded" 3 : "Interactive" 4 : "Complete"
0
"Uninitialized"
1
"Loading"
2
"Loaded"
3
"Interactive"
4
"Complete"