eq相等ne、neq不相等，gt⼤于，lt⼩于gte、ge⼤于等于lte、
le⼩于等于no。。。
eq相等  ne、neq不相等，  gt⼤于， lt⼩于 gte、ge⼤于等于  lte、le ⼩于等于  not⾮  mod求模  is [not] div by是否能被某数整我怕我会掉眼泪
除  is [not] even是否为偶数  is [not] even by $b即($a / $b) % 2 == 0  is [not] odd是否为奇  is not odd by $b即($a / $b) % 2 != 0 ⽰例：
equal/ not equal/ greater than/ less than/ less than or equal/ great than or equal/后⾯的就不⽤说了
Smarty 中的 if 语句和  中的 if 语句⼀样灵活易⽤，并增加了⼏个特性以适宜模板引擎. if 必须于 /if 成对出现. 可以使⽤ else 和 elseif ⼦句. 可以使⽤以下条件修饰词：eq、ne、neq、gt、lt、lte、le、gte、ge、is even、is odd、is not even、is not odd、not、mod、div by、even by、odd by、==、!=、>、<、<=、>=. 使⽤这些修饰词时必须和变量或常量⽤空格格开.
Example 7-11. if statements
例 7-11. if 语句演⽰
{if $name eq "Fred"}
Welcome Sir.
{elseif $name eq "Wilma"}
Welcome Ma'am.
{else}
Welcome, whatever you are.
{/if}
{* an example with "or" logic *}
{if $name eq "Fred" or $name eq "Wilma"}
...
{/if}
{* same as above *}
{if $name == "Fred" || $name == "Wilma"}
...
那英歌曲下载{/if}
{* the following syntax will NOT work, conditional qualifiers
黄晓明上海滩主题曲must be separated from surrounding elements by spaces *}
{if $name=="Fred" || $name=="Wilma"}
...
张哲瀚许凯同框
{/if}
{* parenthesis are allowed *}
{if ( $amount < 0 or $amount > 1000 ) and $volume >= #minVolAmt#}
.
李炜的微博..
{/if}
{* you can also embed php function calls *}
{if count($var) gt 0}
...marit larsen
{/if}
{* test if values are even or odd *}
{if $var is even}
...
{/if}
{if $var is odd}
.
..
{/if}
{if $var is not odd}
...
{/if}
{* test if var is divisible by 4 *}
{if $var is div by 4}
...
{/if}
{* test if var is even, grouped by two. i.e.,
0=even, 1=even, 2=odd, 3=odd, 4=even, 5=even, etc. *} {if $var is even by 2}
.
..
{/if}
{* 0=even, 1=even, 2=even, 3=odd, 4=odd, 5=odd, etc. *} {if $var is even by 3}
...
{/if}