XMLHTTP 的 readyState 值含义:
- 0-未初始化,即尚未调用 open。
- 1-初始化,即尚未调用 send。
- 2-发送数据,即已经调用 send。
- 3-数据传送中。
- 4-完成。
0-uninitialized Object is not initialized with data.
1-loading Object is loading its data.
2-loaded Object has finished loading its data.
3-interactive User can interact with the object even though it is not fully loaded.
4-complete Object is completely initialized.
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