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fix: skip microtask fix in Firefix <= 53 

fix #9446
This commit is contained in:
Evan You 2019-02-06 15:04:24 -05:00
parent 96a09aad99
commit 7bc88f30c3
2 changed files with 8 additions and 2 deletions
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1
src/core/util/env.js
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@ -15,6 +15,7 @@ export const isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform ===
export const isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios')
export const isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge
export const isPhantomJS = UA && /phantomjs/.test(UA)
export const isFF = UA && UA.match(/firefox\/(\d+)/)
// Firefox has a "watch" function on Object.prototype...
export const nativeWatch = ({}).watch

9
src/platforms/web/runtime/modules/events.js
View File

@ -2,7 +2,7 @@
import { isDef, isUndef } from 'shared/util'
import { updateListeners } from 'core/vdom/helpers/index'
import { isIE, supportsPassive, isUsingMicroTask } from 'core/util/index'
import { isIE, isFF, supportsPassive, isUsingMicroTask } from 'core/util/index'
import { RANGE_TOKEN, CHECKBOX_RADIO_TOKEN } from 'web/compiler/directives/model'
import { currentFlushTimestamp } from 'core/observer/scheduler'
@ -39,6 +39,11 @@ function createOnceHandler (event, handler, capture) {
}
}
// #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
// implementation and does not fire microtasks in between event propagation, so
// safe to exclude.
const useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53)
function add (
name: string,
handler: Function,
@ -51,7 +56,7 @@ function add (
// the solution is simple: we save the timestamp when a handler is attached,
// and the handler would only fire if the event passed to it was fired
// AFTER it was attached.
if (isUsingMicroTask) {
if (useMicrotaskFix) {
const attachedTimestamp = currentFlushTimestamp
const original = handler
handler = original._wrapper = function (e) {