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当一个变量在模板内经常使用，而每次使用都需要给它设置default修饰器时，这将会非常不优雅。
你可以用{assign}函数来给变量赋一个默认值。
Example 21.2. 给变量赋默认值
Bitcoin
{* do this somewhere at the top of your template *}
{assign var='title' value=$title|default:'no title'}
{* if $title was empty, it now contains the value "no title" when you use it *}
{$title}