1- /* global MutationObserver */
2-
31// can we use __proto__?
42export const hasProto = '__proto__' in { }
53
@@ -16,21 +14,6 @@ const UA = inBrowser && window.navigator.userAgent.toLowerCase()
1614export const isIE = UA && UA . indexOf ( 'trident' ) > 0
1715export const isIE9 = UA && UA . indexOf ( 'msie 9.0' ) > 0
1816export const isAndroid = UA && UA . indexOf ( 'android' ) > 0
19- export const isIos = UA && / ( i p h o n e | i p a d | i p o d | i o s ) / i. test ( UA )
20- export const iosVersionMatch = isIos && UA . match ( / o s ( [ \d _ ] + ) / )
21- export const iosVersion = iosVersionMatch && iosVersionMatch [ 1 ] . split ( '_' ) . map ( Number )
22-
23- // MutationObserver is unreliable in iOS 9.3 UIWebView
24- // detecting it by checking presence of IndexedDB
25- // ref #3027
26- const hasMutationObserverBug =
27- iosVersion &&
28- ! window . indexedDB && (
29- iosVersion [ 0 ] > 9 || (
30- iosVersion [ 0 ] === 9 &&
31- iosVersion [ 1 ] >= 3
32- )
33- )
3417
3518let transitionProp
3619let transitionEndEvent
@@ -89,27 +72,24 @@ export const nextTick = (function () {
8972}
9073}
9174
92- /* istanbul ignore if */
93- if ( typeof MutationObserver !== 'undefined' && ! hasMutationObserverBug ) {
94- var counter = 1
95- var observer = new MutationObserver ( nextTickHandler )
96- var textNode = document . createTextNode ( counter )
97- observer . observe ( textNode , {
98- characterData :true
75+ /* istanbul ignore else */
76+ if ( inBrowser && window . postMessage &&
77+ ! window . importScripts && // not in WebWorker
78+ ! ( isAndroid && ! window . requestAnimationFrame ) // not in Android <= 4.3
79+ ) {
80+ const NEXT_TICK_TOKEN = '__vue__nextTick__'
81+ window . addEventListener ( 'message' , e => {
82+ if ( e . source === window && e . data === NEXT_TICK_TOKEN ) {
83+ nextTickHandler ( )
84+ }
9985} )
100- timerFunc = function ( ) {
101- counter = ( counter + 1 ) % 2
102- textNode . data = counter
86+ timerFunc = ( ) => {
87+ window . postMessage ( NEXT_TICK_TOKEN , '*' )
10388}
10489} else {
105- // webpack attempts to inject a shim for setImmediate
106- // if it is used as a global, so we have to work around that to
107- // avoid bundling unnecessary code.
108- const context = inBrowser
109- ?window
110- :typeof global !== 'undefined' ?global :{ }
111- timerFunc = context . setImmediate || setTimeout
90+ timerFunc = ( typeof global !== 'undefined' && global . setImmediate ) || setTimeout
11291}
92+
11393return function ( cb , ctx ) {
11494var func = ctx
11595 ?function ( ) { cb . call ( ctx ) }