ProgressEvent.lengthComputable
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
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
| Specification |
|---|
| XMLHttpRequest # dom-progressevent-lengthcomputable |
浏览器兼容性
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See also
- The
ProgressEventinterface it belongs to.