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？