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                            # Present標簽

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present標簽用于判斷某個變量是否已經定義，用法：

~~~
<present name="name">
name已經賦值
</present>
~~~

如果判斷沒有賦值，可以使用：

~~~
<notpresent name="name">
name還沒有賦值
</notpresent>
~~~

可以把上面兩個標簽合并成為：

~~~
<present name="name">
name已經賦值
<else /> 
name還沒有賦值
</present> 
~~~

present標簽的name屬性可以直接使用系統變量，例如：

~~~
<present name="Think.get.name">
$_GET['name']已經賦值
</present>
~~~

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