<!--
 index: int
 msg: string
 time: string
-->
<template name="msgItem">
 <view>
 <text> {{index}}: {{msg}} </text>
 <text> Time: {{time}} </text>
 </view>
</template>

Page({
 data: {
 item: {
 index: 0,
 msg: 'this is a template',
 time: '2016-09-15'
 }
 }
})

<template name="odd">
 <view> odd </view>
</template>
<template name="even">
 <view> even </view>
</template>

<block wx:for="{{[1, 2, 3, 4, 5]}}">
 <template is="{{item % 2 == 0 "/>
</block>