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[{"value":"用法","id":"用法","hLevel":2,"level":1},{"value":"例子","id":"例子","hLevel":2,"level":1}]
else
在for循环长度为零时，指定要执行的默认表达式。
用法
{{
#for
variable
}}
first_expression
{{
else
}}
second_expression
{{
/for
}}
例子
{{
#for
variable
}}
first_expression
{{
else
}}
second_expression
{{
/for
}}
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