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XMLHttpRequest.status 屬性根據XMLHttpRequest的回應傳回數值化的狀況編碼。狀況編碼為一正短整數（unsigned short）。Before the request is complete, the value of status will be 0. It is worth noting that browsers report a status of 0 in case of XMLHttpRequest errors too.
The status codes returned are the standard HTTP status codes. For example, status 200 denotes a successful request. If the server response doesn't explicitly specify a status code, XMLHttpRequest.status will assume the default value of 200.
Example
var xhr = new XMLHttpRequest();
console.log('UNSENT', xhr.status);
xhr.open('GET', '/server', true);
console.log('OPENED', xhr.status);
xhr.onprogress = function () {
console.log('LOADING', xhr.status);
};
xhr.onload = function () {
console.log('DONE', xhr.status);
};
xhr.send(null);
/**
* Outputs the following:
*
* UNSENT 0
* OPENED 0
* LOADING 200
* DONE 200
*/
Specifications
| Specification | Status | Comment |
|---|---|---|
| XMLHttpRequest | Living Standard | WHATWG living standard |
Browser compatibility
We're converting our compatibility data into a machine-readable JSON format.
This compatibility table still uses the old format,
because we haven't yet converted the data it contains.
Find out how you can help!
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 1 | 1.0 (1.7 or earlier)[1] | 7[1] | (Yes) | 1.2 |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | ? | 1.0 | (Yes) | ? | ? | ? |
[1] Internet Explorer versions 5 and 6 lacked the XMLHttpRequest object, but provided a way to make AJAX requests using ActiveXObject.
See also
- List of HTTP response codes