XMLHttpRequest readyState
Integer reporting the status of the request:
0 = uninitialized
1 = loading 已调用open方法
2 = loaded 已调用send方法
3 = interactive 已接收部分数据
4 = completed 数据接收完毕,此时可以通过通过responseBody和responseText获取完整的回应数据
XMLHttpRequest readyState
Integer reporting the status of the request:
0 = uninitialized
1 = loading 已调用open方法
2 = loaded 已调用send方法
3 = interactive 已接收部分数据
4 = completed 数据接收完毕,此时可以通过通过responseBody和responseText获取完整的回应数据