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[Vue.js] 循环语句

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发表于 2018-7-4 10:56:27 | 只看该作者回帖奖励

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循环使用 v-for 指令。

v-for 指令需要以 site in sites 形式的特殊语法， sites 是源数据数组并且 site 是数组元素迭代的别名。

v-for 可以绑定数据到数组来渲染一个列表：

v-for 指令

<div id="app">" u7 c" G& b0 Z* ]* S; x
<ol>
; z E3 U. y3 a' B5 A$ @3 _& K- r
<li v-for="site in sites">* C; x6 H0 Y: u" G
{{ site.name }}
; Y* M) N, X! e: f' V) M1 f, }
</li>
6 g8 ~6 G6 K: h2 ]% ]
</ol>
+ m# ^+ b/ [; w. F! o
</div>8 }8 a7 w: c8 _1 r) u) f: M
, a( t( ]& x. z) A( x3 F/ m& b
<script>
. n$ S( Y+ K% ~1 k6 Z
new Vue({
1 ^4 K2 o" j/ [8 J
el: '#app',1 i3 S9 T' | z( I6 k* e" t
data: {
/ {4 d6 `) z4 K4 i9 b; N
sites: [
; c, ^9 V7 G; o1 B
{ name: 'Runoob' },
3 c1 l7 J6 w, j% Q
{ name: 'Google' },
& L6 K5 q O6 g5 f1 y O3 ] [
{ name: 'Taobao' }
: `5 s6 C* g; o) Y' e. a9 n% l% M; h
]( y2 f( o5 M, j0 G/ C- O B- S
}
7 V0 F$ R& ]* I
})
/ K# \! u: H( ?: p2 X8 {& e
</script>

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模板中使用 v-for：

v-for

<ul>. D! }# F* O9 F+ u3 m% {& ?
<template v-for="site in sites">
/ J- q, ?4 b; |: Y% ?
<li>{{ site.name }}</li>
! _7 }, q# h0 o1 \8 l
<li>--------------</li> O7 X( W, N% j9 E
</template>
2 m" Y* a0 `2 L) l1 `& {
</ul>

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v-for 迭代对象

v-for 可以通过一个对象的属性来迭代数据：

v-for

<div><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;"><</span><span class="hl-reserved" style="border: 0px; color: green; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">div</span><span class="hl-code" style="border: 0px; color: gray; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;"> </span><span class="hl-var" style="border: 0px; color: rgb(0, 0, 139); font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">id</span><span class="hl-code" style="border: 0px; color: gray; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">=</span><span class="hl-quotes" style="border: 0px; color: rgb(139, 0, 0); font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">"</span><span class="hl-string" style="border: 0px; color: rgb(170, 17, 17); font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">app</span><span class="hl-quotes" style="border: 0px; color: rgb(139, 0, 0); font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">"</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">></span><span class="hl-code" style="border: 0px; color: gray; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">
1 _& K, {$ {: ?7 @- Y
</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;"><</span><span class="hl-reserved" style="border: 0px; color: green; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">ul</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">></span><span class="hl-code" style="border: 0px; color: gray; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">- l! ~$ O# h/ O/ F+ G' h0 Z
</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;"><</span><span class="hl-reserved" style="border: 0px; color: green; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">li</span><span class="hl-code" style="border: 0px; color: gray; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;"> </span><span class="hl-var" style="border: 0px; color: rgb(0, 0, 139); font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">v-for</span><span class="hl-code" style="border: 0px; color: gray; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">=</span><span class="hl-quotes" style="border: 0px; color: rgb(139, 0, 0); font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">"</span><span class="hl-string" style="border: 0px; color: rgb(170, 17, 17); font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">value in object</span><span class="hl-quotes" style="border: 0px; color: rgb(139, 0, 0); font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">"</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">></span><span class="hl-code" style="border: 0px; color: gray; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">0 C3 [/ }5 M$ v. k# V. t
{{ value }}
9 q% ?( M- `2 l6 A9 S
</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;"></</span><span class="hl-reserved" style="border: 0px; color: green; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">li</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">></span><span class="hl-code" style="border: 0px; color: gray; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">
: ]1 B! \* H" I. K3 i) P
</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;"></</span><span class="hl-reserved" style="border: 0px; color: green; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">ul</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">></span><span class="hl-code" style="border: 0px; color: gray; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">% G+ I: t. t$ L
</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;"></</span><span class="hl-reserved" style="border: 0px; color: green; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">div</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">></span><span class="hl-code" style="border: 0px; color: gray; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;"> b; }3 @5 H% Q6 x
5 V" m y& {# r7 C. K! c) q
</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;"><</span><span class="hl-reserved" style="border: 0px; color: green; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">script</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">></span><span class="hl-code" style="border: 0px; color: gray; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">6 H" `4 t: Y8 `9 ` ^* W& l
new Vue({2 Y- f- l: z* W9 c
el: '#app',
6 K, V/ c1 U' y% {
data: {
+ G& J7 V6 r8 I$ ~+ b5 G# q! Y6 n
object: {
- ]; G& v6 J5 ?2 ^" e: C; D# i: y
name: '菜鸟教程',
8 M4 K2 I5 C( ^+ a& {; O) m
url: 'http://www.runoob.com',
/ M& W4 l" Z9 C V/ l8 Q8 v$ \
slogan: '学的不仅是技术，更是梦想！'0 k. r& {* q+ Z% E0 r3 z
}: e- V& v' K H+ s! B! V$ g
}) R& u) i7 B- v( D
})
- m; Z% Q! s! I2 v
</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;"></</span><span class="hl-reserved" style="border: 0px; color: green; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">script</span><span class="hl-brackets" style="border: 0px; color: olive; font-family: Menlo, Monaco, Consolas, "Andale Mono", "lucida console", "Courier New", monospace; font-size: 13.2px; white-space: pre-wrap;">></span></div><div></div>

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你也可以提供第二个的参数为键名：

v-for

<div id="app">
7 B3 E4 |0 u4 P" z
<ul>
' L; K1 y2 n! M3 g7 ?& J
<li v-for="(value, key) in object">" A2 p; ~3 m9 P
{{ key }} : {{ value }}
# ^3 j! S, u1 l! S' ]* b; d
</li>+ A6 w" C9 ~* ]& g5 ~# j. [
</ul>
. G: G Q- |) @; S& u
</div>

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第三个参数为索引：

v-for

<div id="app">
/ r/ x/ t2 p* n' m: G+ A6 M
<ul>5 b& A- d" R0 n: t
<li v-for="(value, key, index) in object">3 Q" O9 J! q, B' p+ [
{{ index }}. {{ key }} : {{ value }}
3 ]* z9 w4 A1 @; e$ t- l
</li>6 Y; Q& P7 n& m# ]. k
</ul>
3 Q7 l' n1 b7 t6 y$ L0 q' k/ C2 i4 r
</div>

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v-for 迭代整数

v-for 也可以循环整数

v-for

<div id="app"> U/ H/ V, K: d: c3 v
<ul>" T5 q% V6 V# _$ G& k" [ M
<li v-for="n in 10">" D3 |* x& ]% [% u
{{ n }}6 v0 G$ `3 D# R2 N5 i
</li>1 E, _. z* Q' U% W: Z* u2 f3 ]7 ~2 F
</ul>) ?4 T m. ~: g |" D- O: N+ c
</div>

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