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 July 2015.

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

See also