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perf: skip normalization on single child element v-for

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This commit is contained in:
Evan You 2018-12-11 16:51:40 -05:00
parent 47487607fb
commit 4074104fac
2 changed files with 10 additions and 8 deletions
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4
src/compiler/codegen/index.js
View File

@ -406,7 +406,9 @@ export function genChildren (
el.tag !== 'template' &&
el.tag !== 'slot'
) {
const normalizationType = checkSkip && state.maybeComponent(el) ? `,1` : ``
const normalizationType = checkSkip
? state.maybeComponent(el) ? `,1` : `,0`
: ``
return `${(altGenElement || genElement)(el, state)}${normalizationType}`
}
const normalizationType = checkSkip

14
test/unit/modules/compiler/codegen.spec.js
View File

@ -54,25 +54,25 @@ describe('codegen', () => {
it('generate v-for directive', () => {
assertCodegen(
'<div><li v-for="item in items" :key="item.uid"></li></div>',
`with(this){return _c('div',_l((items),function(item){return _c('li',{key:item.uid})}))}`
`with(this){return _c('div',_l((items),function(item){return _c('li',{key:item.uid})}),0)}`
)
// iterator syntax
assertCodegen(
'<div><li v-for="(item, i) in items"></li></div>',
`with(this){return _c('div',_l((items),function(item,i){return _c('li')}))}`
`with(this){return _c('div',_l((items),function(item,i){return _c('li')}),0)}`
)
assertCodegen(
'<div><li v-for="(item, key, index) in items"></li></div>',
`with(this){return _c('div',_l((items),function(item,key,index){return _c('li')}))}`
`with(this){return _c('div',_l((items),function(item,key,index){return _c('li')}),0)}`
)
// destructuring
assertCodegen(
'<div><li v-for="{ a, b } in items"></li></div>',
`with(this){return _c('div',_l((items),function({ a, b }){return _c('li')}))}`
`with(this){return _c('div',_l((items),function({ a, b }){return _c('li')}),0)}`
)
assertCodegen(
'<div><li v-for="({ a, b }, key, index) in items"></li></div>',
`with(this){return _c('div',_l((items),function({ a, b },key,index){return _c('li')}))}`
`with(this){return _c('div',_l((items),function({ a, b },key,index){return _c('li')}),0)}`
)
// v-for with extra element
assertCodegen(
@ -126,7 +126,7 @@ describe('codegen', () => {
it('generate ref on v-for', () => {
assertCodegen(
'<ul><li v-for="item in items" ref="component1"></li></ul>',
`with(this){return _c('ul',_l((items),function(item){return _c('li',{ref:"component1",refInFor:true})}))}`
`with(this){return _c('ul',_l((items),function(item){return _c('li',{ref:"component1",refInFor:true})}),0)}`
)
})
@ -597,7 +597,7 @@ describe('codegen', () => {
it('generate static trees inside v-for', () => {
assertCodegen(
`<div><div v-for="i in 10"><p><span></span></p></div></div>`,
`with(this){return _c('div',_l((10),function(i){return _c('div',[_m(0,true)])}))}`,
`with(this){return _c('div',_l((10),function(i){return _c('div',[_m(0,true)])}),0)}`,
[`with(this){return _c('p',[_c('span')])}`]
)
})