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screen->section->condition

 
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<condition>元素是<section>的一个子元素。如果该元素的条件计算是真,那么then部分将被执行,否则else将被执行。condition内部可以放12种条件语句。其中四个是逻辑语句:

<and>

<xor>

<or>

<not>

3个是权限条件

<if-service-permission>

<if-has-permission>

<if-entity-permission>

5个比较条件

<if-validate-method>

<if-compare>

<if-compare-field>

<ifregexp>

<if-empty>
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