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fix(scheduler): fix getNow check in IE9 (#9647)

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fix #9632
This commit is contained in:
Felix Bünemann 2019-03-08 18:04:28 +01:00 committed by Evan You
parent 0b57380f10
commit da77d6a98b
1 changed files with 9 additions and 4 deletions
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13
src/core/observer/scheduler.js
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@ -47,10 +47,15 @@ let getNow: () => number = Date.now
// timestamp can either be hi-res (relative to page load) or low-res
// (relative to UNIX epoch), so in order to compare time we have to use the
// same timestamp type when saving the flush timestamp.
if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
// if the low-res timestamp which is bigger than the event timestamp
// (which is evaluated AFTER) it means the event is using a hi-res timestamp,
// and we need to use the hi-res version for event listeners as well.
if (
inBrowser &&
window.performance &&
typeof performance.now === 'function' &&
getNow() > document.createEvent('Event').timeStamp
) {
// if the event timestamp is bigger than the hi-res timestamp
// (which is evaluated AFTER) it means the event is using a lo-res timestamp,
// and we need to use the lo-res version for event listeners as well.
getNow = () => performance.now()
}