Wechat applet for loop

1. First, in the js In file data It is defined list

periodList:[
  {
    id:1,
    name:' The kindergarten '
  },
  {
    id:2,
    name:' Primary school '
  },
  {
    id:3,
    name:' Junior high school '
  }
]

2. Used on the page

<view>
    <ul class="item-list">
      <li wx:for="{
   {periodList}}" wx:for-item="period" 
      wx:key="id">{
   {period.name}}</li>
    </ul>
</view>

without  wx:for-item="period"  So the default is item