http://wbex.ru/index.php?action=history&feed=atom&title=JavaScript_Tutorial%2FStatement%2FSwitch
JavaScript Tutorial/Statement/Switch - История изменений
2026-04-04T10:12:49Z
История изменений этой страницы в вики
MediaWiki 1.30.0
http://wbex.ru/index.php?title=JavaScript_Tutorial/Statement/Switch&diff=9363&oldid=prev
Admin: 1 версия
2010-05-26T08:25:00Z
<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 08:25, 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/Statement/Switch&diff=9362&oldid=prev
в 18:52, 25 мая 2010
2010-05-25T18:52:56Z
<p></p>
<p><b>Новая страница</b></p><div>== Switch Statement with calculation==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<head><br />
<title>Switch Statement Demo</title><br />
<script language="javascript" type="text/javascript"><br />
<!--<br />
switch (1+1){<br />
case "a":<br />
alert(1);<br />
case 2:<br />
alert(2);<br />
case true:<br />
alert(3);<br />
}<br />
//--><br />
</script><br />
</head><br />
<body><br />
<h1>Switch Statement Demo</h1><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Switch statement with default value==<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 yourchoice;<br />
yourchoice = prompt("Choose a number between 1 and 4", "1, 2, 3 or 4")<br />
switch (yourchoice)<br />
{<br />
case "1":<br />
alert("You typed in a 1");<br />
break;<br />
case "2":<br />
alert("You typed in a 2");<br />
break;<br />
case "3":<br />
alert("You typed in a 3");<br />
break;<br />
case "4":<br />
alert("You typed in a 4");<br />
break;<br />
default:<br />
alert("You didn"t type in a number between 1 and 4");<br />
break;<br />
}<br />
// --><br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Switch Statement with Integer as the control variable==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<head><br />
<title>Switch Statement Demo</title><br />
<script language="javascript" type="text/javascript"><br />
<!--<br />
switch (2){<br />
case "a":<br />
alert(1);<br />
case 2:<br />
alert(2);<br />
case true:<br />
alert(3);<br />
}<br />
//--><br />
</script><br />
</head><br />
<body><br />
<h1>Switch Statement Demo</h1><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Switch statement with return value from a prompt dialog==<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 yourchoice;<br />
yourchoice = prompt("Choose a number between 1 and 4", "1, 2, 3 or 4")<br />
switch (yourchoice)<br />
{<br />
case "1":<br />
alert("You typed in a 1");<br />
break;<br />
case "2":<br />
alert("You typed in a 2");<br />
break;<br />
case "3":<br />
alert("You typed in a 3");<br />
break;<br />
case "4":<br />
alert("You typed in a 4");<br />
break;<br />
}<br />
// --><br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Switch with boolean value==<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 yourchoice;<br />
yourchoice = confirm("Are you at your computer now?")<br />
switch (yourchoice)<br />
{<br />
case true:<br />
alert("true");<br />
break;<br />
case false:<br />
alert("false");<br />
break;<br />
}<br />
// --><br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Use switch statement to deal with form input value==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<head><br />
<title>Using the switch statement</title><br />
<script language="JavaScript"><br />
<!--<br />
function verifyDay(form){<br />
var myEntry = form.day.value.toUpperCase();<br />
var firstPart = "You have entered a day at the first of the week";<br />
var endPart = "You have entered a day at the end of the week";<br />
var weekEnd = "You have entered a weekend day";<br />
switch(myEntry){<br />
case "MONDAY" :<br />
alert(firstPart);<br />
break;<br />
case "TUESDAY" :<br />
alert(firstPart);<br />
break;<br />
case "WEDNESDAY" :<br />
alert("You have entered a "hump" day");<br />
break;<br />
case "THURSDAY" :<br />
alert(endPart);<br />
break;<br />
case "FRIDAY" :<br />
alert(endPart);<br />
break;<br />
case "SATURDAY" :<br />
alert(weekEnd);<br />
break;<br />
case "SUNDAY" :<br />
alert(weekEnd);<br />
break;<br />
default :<br />
alert("You have entered an invalid day");<br />
}<br />
}<br />
--><br />
</script><br />
</head><br />
<body><br />
<form name="myForm"><br />
<b>Please enter a day of the week:</b><br><br />
<input type=TEXT value="" name="day"><br />
<input type=BUTTON value="Verify" name="myButton" onClick="verifyDay(this.form)"><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Using the switch Structure==<br />
<br />
<p>JavaScript offers the switch statement as an alternative to using the if...else structure.</p><br />
<p>The switch statement is useful when testing all the possible results of an expression.</p><br />
<p>The format of a switch structure looks like the following:</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
switch (expression)<br />
{<br />
case label1:<br />
statement1;<br />
break;<br />
case label2:<br />
statement2;<br />
break;<br />
default:<br />
statement3;<br />
}</source></div>