<view wx:for="{{[1,2,3,4,5,6,7,8,9]}}" wx:for-item="i" class="container">
    <view wx:for="{{[1,2,3,4,5,6,7,8,9]}}" wx:for-item='j'>
        <view wx:if="{{j<=i}}">
            {{j}}*{{i}} = {{(i)*j}}
        </view>
    </view>