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ProgressEvent.lengthComputable 只读属性是一个布尔Boolean 标志，表示ProgressEvent 所关联的资源是否具有可以计算的长度。否则 ，ProgressEvent.total 属性将是一个无意义的值。
语法
flag = ProgressEvent.lengthComputable
规范
| 规范 | 状态 | 备注 |
|---|---|---|
| XMLHttpRequest ProgressEvent.lengthComputable |
Living Standard |
浏览器兼容性
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| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 未实现 | (Yes) | 3.5 (1.9.1) | 未实现 | 未实现 | 未实现 |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | 未实现 | (Yes) | 1.0 (1.9.1) | 未实现 | 未实现 | 未实现 |
See also
- The
ProgressEventinterface it belongs to.