Perl的控制流(if条件，while,for循环。。。)
1. 语句块：{ }之间的部分即为BLOCK语句块。
2. 条件语句：
<div style="padding-right: 5.4pt; padding-left: 5.4pt; background: #e6e6e6; padding-bottom: 4px; width: 95%; padding-top: 4px;">http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifif(expression)BLOCK;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifif(expression)
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifBLOCK1
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifelseBLOCK2;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifif(expression1)
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifBLOCK1;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifelsif(expression2)
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifBLOCK2;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifelse
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifBLOCK3;
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif#倒置的if语句
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gifexpressionif(test_expression);
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
http://images.csdn.net/syntaxhighlighting/OutliningIndicators/None.gif
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