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JavaScript Tutorial/Statement/For Loop - История изменений
2026-04-04T11:31:56Z
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Admin: 1 версия
2010-05-26T08:25:00Z
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Admin
http://wbex.ru/index.php?title=JavaScript_Tutorial/Statement/For_Loop&diff=9370&oldid=prev
в 18:52, 25 мая 2010
2010-05-25T18:52:56Z
<p></p>
<p><b>Новая страница</b></p><div>== Check the loop counter==<br />
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<!-- start source code --><br />
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<source lang="javascript"><br />
<html><br />
<head><br />
<title></title><br />
</head><br />
<body><br />
<script type="text/javascript"><br />
for (var i = 1; i < 101; i++) {<br />
if (i == 99) {<br />
alert("The number is " + i);<br />
}<br />
}<br />
</script><br />
</body><br />
</html></source><br />
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== Counting backward through a for loop==<br />
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<!-- start source code --><br />
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<source lang="javascript"><br />
<html><br />
<head><br />
<title>Back Racer</title><br />
<script><br />
var i = 0;<br />
for (i = 10; i > 0; i--){<br />
alert(i);<br />
}<br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source><br />
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== for Loops==<br />
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<p>The for loop is a structure that loops for a preset number of times.</p><br />
<p>The for loop is made up of two parts: condition and statement.</p><br />
<p>The condition structure determines how many times the loop repeats.</p><br />
<p>The statement is what is executed every time the loop occurs.</p><br />
<p>The condition structure is contained within parentheses and is made up of three parts.</p><br />
<p>Each part is separated by a semicolon (;).</p><br />
<p>The first part of the condition structure initializes a variable to a starting value.</p><br />
<p>In most cases, the variable is declared within this section as well as initialized.</p><br />
<p>The second part is the conditional statement.</p><br />
<p>The third and final part determines how the variable should be changed each time the loop is iterated.</p><br />
<p>The format of the for loop looks like the following:</p><br />
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<!-- start source code --><br />
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<source lang="javascript"><br />
for (initialize; condition; adjust) {<br />
statement;<br />
}</source><br />
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== For loop with undeclared loop counter==<br />
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<!-- start source code --><br />
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<source lang="javascript"><br />
<HTML><br />
<HEAD><br />
<SCRIPT language="JavaScript"><br />
<!--<br />
for (count=1;count<16;count+=1)<br />
{<br />
document.write(count+". This is getting way too repetitive.<BR>");<br />
}<br />
//--><br />
</SCRIPT><br />
</HEAD><br />
<BODY><br />
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</BODY><br />
</HTML></source><br />
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== Multiplication Table Generator by using for loop==<br />
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<!-- start source code --><br />
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<source lang="javascript"><br />
<html><br />
<head><br />
<title>Multiplication Table Generator</title><br />
<script language="javascript" type="text/javascript"><br />
<!--<br />
function generateTable()<br />
{<br />
var myVar = prompt("A number?", "");<br />
var myString = "";<br />
for (i=1; i<=6; i++) {<br />
myString += i+ " x " +myVar+ " = " +(i*myVar)+ "\n";<br />
}<br />
alert(myString);<br />
}<br />
//--><br />
</script><br />
</head><br />
<body><br />
<a href="javascript:generateTable()">Create New Table</a><br />
</body><br />
</html></source><br />
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== Reversed for loop==<br />
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<!-- start source code --><br />
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<source lang="javascript"><br />
<html><br />
<head><br />
<title>A Simple Page</title><br />
<script language="JavaScript"><br />
<!--<br />
for (x = 10; x >= 0; x = x - 2)<br />
{<br />
document.write(x);<br />
}<br />
// --><br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source><br />
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== Set loop step to 5 in for loop==<br />
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<!-- start source code --><br />
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<source lang="javascript"><br />
<html><br />
<head><br />
<title>Count By Five</title><br />
<script><br />
var i = 0;<br />
for (i=5; i <= 100; i += 5){<br />
alert (i);<br />
}<br />
</script><br />
</head><br />
<body><br />
<h1>Count By Five<br></h1><br />
</body><br />
</html></source><br />
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== Use for statement to loop through all elements in an array==<br />
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<!-- start source code --><br />
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<source lang="javascript"><br />
<html><br />
<head><br />
<title>Use for statement to loop through all elements in an array</title><br />
</head><br />
<body><br />
<P><br />
<script language="javascript" type="text/javascript"><br />
<!--<br />
var myArray = new Array();<br />
myArray[0] = "AAA";<br />
myArray[1] = "BBB";<br />
myArray[2] = "CCC";<br />
for (var i=0; i<myArray.length; i++) {<br />
document.write("Element " +i+ " contains: " +myArray[i]+ "<br />");<br />
}<br />
//--><br />
</script><br />
</p><br />
</body><br />
</html></source><br />
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== Using the JavaScript for Loop==<br />
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<!-- start source code --><br />
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<source lang="javascript"><br />
<HTML><br />
<HEAD><br />
<TITLE><br />
Using the JavaScript for Loop<br />
</TITLE><br />
</HEAD><br />
<BODY><br />
<H1>Using the JavaScript for Loop</H1><br />
<SCRIPT LANGUAGE="JavaScript"><br />
<!--<br />
var i, total<br />
total = 0<br />
for (i = 1; i < 5; i++) {<br />
total += i<br />
document.write("Loop iteration " + i + " (Cumulative total = " + total + ")<BR>")<br />
}<br />
// --><br />
</SCRIPT><br />
</BODY><br />
</HTML></source></div>