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比较操作符，正如它的名字所示，允许您比较两个值。
table 7-4. comparson operators（表7-4 比较操作符）
example name result?/font>
$a == $b equal?/font> true if $a is equal to $b.?/font>
$a != $b not equal true if $a is not equal to $b.?/font>
$a < $b less than?/font> true if $a is strictly less than $b.?/font>
$a > $b greater than?/font> true if $a is strictly greater than $b.?/font>
$a <= $b less than or equal to?/font> true if $a is less than or equal to $b.?/font>
$a >= $b greater than or equal to?/font> true if $a is greater than or equal to $b.
