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JavaScript Tutorial/Operators/Prefix operator - История изменений
2026-04-04T18:00:19Z
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Admin: 1 версия
2010-05-26T08:24:52Z
<p>1 версия</p>
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Admin
http://wbex.ru/index.php?title=JavaScript_Tutorial/Operators/Prefix_operator&diff=9176&oldid=prev
в 18:52, 25 мая 2010
2010-05-25T18:52:56Z
<p></p>
<p><b>Новая страница</b></p><div>== Pre-Decrement==<br />
<br />
<p>The pre-decrement operator (--) is placed to the left of a variable.</p><br />
<p>The pre-decrement operator decrements the value by 1.</p><br />
<p>If the variable is a string, it is converted to a number.</p><br />
2. 3. Prefix operator<br />
2. 3. 1. <br />
<A href="/Tutorial/JavaScript/0040__Operators/PreIncrement.htm">Pre-Increment</a><br />
2. 3. 2. <br />
Pre-Decrement<br />
2. 3. 3. <br />
<A href="/Tutorial/JavaScript/0040__Operators/Prefixoperator.htm">Prefix operator: ++</a><br />
2. 3. 4. <br />
<A href="/Tutorial/JavaScript/0040__Operators/Prefixoperator2.htm">Prefix operator 2: --</a><br />
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== Prefix operator: ++==<br />
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<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<head><br />
<title>A Simple Page</title><br />
<script language="JavaScript"><br />
<!--<br />
var a = 6, b = 2;<br />
alert(++a + b);<br />
// --><br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source><br />
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<br />
== Prefix operator 2: --==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<head><br />
<title>A Simple Page</title><br />
<script language="JavaScript"><br />
<!--<br />
var a = 6, b = 2;<br />
alert(--a + b);<br />
// --><br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Pre-Increment==<br />
<br />
<p>The pre-increment operator is placed directly before the variable.</p><br />
<p>The operation begins by incrementing the variable by 1.</p><br />
<p>The new incremented value is returned by the operation to be used in another expression.</p><br />
<p>If the variable is a string, it is converted to a number.</p><br />
<p>For example, the following segment of code</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
var price = 5<br />
var newPrice = (++price) + 3;</source></div>