rownum
rownum is used to display the current loop iteration, starting with one. It
is an alias to iteration, they work identically.
rownum 用于显示循环的次数. 该属性是iteration的别名，两者等同.
Example 7-27. section property rownum
例 7-27. section 的 rownum 属性演示
{section name=customer loop=$custid}
{$smarty.section.customer.rownum} id: {$custid[customer]}<br>
{/section}
OUTPUT:
1 id: 1000<br>
2 id: 1001<br>
3 id: 1002<br>
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