{if !isset($item_len) }> <{assign var="item_len" value="20"}> <{/if}> <{if !isset($num_per_line)}> <{assign var="num_per_line" value="3"}> <{/if}> <{if !isset($date_format)}> <{assign var="date_format" value="%m-%d"}> <{/if}> <{if !isset($currency_unit)}> <{assign var="currency_unit" value="元"}> <{/if}>