improve util.nextTick by setImmediate

勾股 · 勾股 · commit cc705567eb29 · 2016-01-21T07:29:28.000+08:00
diff --git a/src/util/env.js b/src/util/env.js
@@ -70,8 +70,11 @@ export const nextTick = (function () {
       copies[i]()
     }
   }
+
   /* istanbul ignore if */
-  if (typeof MutationObserver !== 'undefined') {
+  if (typeof setImmediate === 'function') {
+    timerFunc = setImmediate
+  } else if (typeof MutationObserver !== 'undefined') {
     var counter = 1
     var observer = new MutationObserver(nextTickHandler)
     var textNode = document.createTextNode(counter)

Original file line number	Diff line number	Diff line change
`@@ -70,8 +70,11 @@ export const nextTick = (function () {`
`70`	`70`	`copies[i]()`
`71`	`71`	`}`
`72`	`72`	`}`
	`73`	`+`
`73`	`74`	`/* istanbul ignore if */`
`74`		`- if (typeof MutationObserver !== 'undefined') {`
	`75`	`+ if (typeof setImmediate === 'function') {`
	`76`	`+ timerFunc = setImmediate`
	`77`	`+ } else if (typeof MutationObserver !== 'undefined') {`
`75`	`78`	`var counter = 1`
`76`	`79`	`var observer = new MutationObserver(nextTickHandler)`
`77`	`80`	`var textNode = document.createTextNode(counter)`