http://wbex.ru/index.php?action=history&feed=atom&title=JavaScript_Tutorial%2FOperators%2FAssignment
JavaScript Tutorial/Operators/Assignment - История изменений
2026-04-04T12:20:08Z
История изменений этой страницы в вики
MediaWiki 1.30.0
http://wbex.ru/index.php?title=JavaScript_Tutorial/Operators/Assignment&diff=9163&oldid=prev
Admin: 1 версия
2010-05-26T08:24:51Z
<p>1 версия</p>
<table class="diff diff-contentalign-left" data-mw="interface">
<tr style="vertical-align: top;" lang="ru">
<td colspan="1" style="background-color: white; color:black; text-align: center;">← Предыдущая</td>
<td colspan="1" style="background-color: white; color:black; text-align: center;">Версия 08:24, 26 мая 2010</td>
</tr><tr><td colspan="2" style="text-align: center;" lang="ru"><div class="mw-diff-empty">(нет различий)</div>
</td></tr></table>
Admin
http://wbex.ru/index.php?title=JavaScript_Tutorial/Operators/Assignment&diff=9162&oldid=prev
в 18:52, 25 мая 2010
2010-05-25T18:52:56Z
<p></p>
<p><b>Новая страница</b></p><div>== Advanced Assignment Operators==<br />
<br />
<p>Advanced assignment operators combine the basic assignment and other operators into one functional operator.</p><br />
Operator<br />
Example<br />
Description<br />
+=<br />
x+=y<br />
x = x + y;<br />
-=<br />
x-=y<br />
x = x - y;<br />
*=<br />
x*=y<br />
x = x * y;<br />
/=<br />
x/=y<br />
x = x / y;<br />
%=<br />
x%=y<br />
x = x % y;<br />
<<=<br />
x<<=y<br />
x = x << y;<br />
>>=<br />
x>>=y<br />
x = x >> y;<br />
>>>=<br />
x>>>=y<br />
x = x >>> y;<br />
&=<br />
x&=y<br />
x = x & y;<br />
|=<br />
x|=y<br />
x = x | y;<br />
^=<br />
x^=y<br />
x = x ^ y;<br />
<p>All the advanced assignment operators, except for +=, will attempt to convert strings to numbers.</p><br />
<p>If strings are used with the += operator, the left operand is concatenated to the end of the right operand.</p><br />
<p>The following example uses the Addition Operator to Perform String Concatenation.</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<SCRIPT LANGUAGE="JavaScript"><br />
<!--<br />
y = "A";<br />
y += "B";<br />
document.write("y= ",y);<br />
--><br />
</SCRIPT><br />
</html></source><br />
<br />
<br />
<br />
== Assignment by Value Versus by Reference==<br />
<br />
<p>When the assignment operator works on primitive values (numbers, strings, Boolean, null, and undefined), a copy of the value is made.</p><br />
<p>When the assignment operator works on JavaScript objects, references to the objects are copied.</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<SCRIPT LANGUAGE="JavaScript"><br />
<!--<br />
var number1 = 9;<br />
var arrayOfNum1 = new Array(2,6);<br />
var number2 = number1;<br />
var arrayOfNum2 = arrayOfNum1;<br />
number2 = 2;<br />
arrayOfNum2[1] = 4;<br />
document.write("number1=",number1,"<BR>");<br />
document.write("number2=",number2,"<BR>");<br />
document.write("arrayOfNum1[0]=",arrayOfNum1[0],"<BR>");<br />
document.write("arrayOfNum1[1]=",arrayOfNum1[1],"<BR>");<br />
document.write("arrayOfNum2[0]=",arrayOfNum2[0],"<BR>");<br />
document.write("arrayOfNum2[1]=",arrayOfNum2[1],"<BR>");<br />
--><br />
</SCRIPT><br />
</html></source><br />
<br />
<br />
<br />
== Assignment operator==<br />
<br />
<p>The basic format of the assignment operator is:</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
x = 6;</source><br />
<br />
<br />
<br />
== x *= 2 (Compound Multiply)==<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 x = 6;<br />
alert(x *= 2);<br />
// --><br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== x += 2 (Compound Plus)==<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 x = 6;<br />
alert(x += 2);<br />
// --><br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== x -= 2 (Compound Subtraction)==<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 x = 6;<br />
alert(x -= 2);<br />
// --><br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== x /= 2 (Multiply Divide)==<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 x = 6;<br />
alert(x /= 2);<br />
// --><br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source></div>