page中定义starNum = 2；

这样写，只会打印一个图片

<block wx:for="{{starNum}}">

    <image src='https://fangmaster-pic.oss-cn-beijing.aliyuncs.com/small_program/grade-star.png' mode="widthFix"></image>

</block>

<block wx:for="2">

    <image src='https://fangmaster-pic.oss-cn-beijing.aliyuncs.com/small_program/grade-star.png' mode="widthFix"></image>

</block>

这样写，会打印两个图片

<block wx:for="{{2}}">

    <image src='https://fangmaster-pic.oss-cn-beijing.aliyuncs.com/small_program/grade-star.png' mode="widthFix"></image>

</block>

<block wx:if="{{starNum > 0}}" wx:for="{{[1,2]}}">

    <image src='https://fangmaster-pic.oss-cn-beijing.aliyuncs.com/small_program/grade-star.png' mode="widthFix"></image>

</block>

这样写，会打印三个图片

<block wx:if="{{starNum > 0}}" wx:for="[1,2]">

    <image src='https://fangmaster-pic.oss-cn-beijing.aliyuncs.com/small_program/grade-star.png' mode="widthFix"></image>

</block>

为什么会出现这种情况呢？完全搞不懂逻辑

我想实现

<block wx:for="{{starNum}}">

    <image src='https://fangmaster-pic.oss-cn-beijing.aliyuncs.com/small_program/grade-star.png' mode="widthFix"></image>

</block>

能够打印2个图片，该怎么做？