⭐ 欢迎来到虫虫下载站! | 📦 资源下载 📁 资源专辑 ℹ️ 关于我们
⭐ 虫虫下载站

📄 js_comparisons.asp

📁 W3Schools tutorial..web designing
💻 ASP
📖 第 1 页 / 共 2 页
字号:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en-US" xml:lang="en-US" xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>JavaScript Comparison and Logical Operators</title>
 
<link rel="shortcut icon" href="../favicon.ico" type="image/x-icon" />
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<meta name="Keywords" content="xml,tutorial,html,dhtml,css,xsl,xhtml,javascript,asp,ado,vbscript,dom,sql,colors,soap,php,authoring,programming,training,learning,beginner's guide,primer,lessons,school,howto,reference,examples,samples,source code,tags,demos,tips,links,FAQ,tag list,forms,frames,color table,w3c,cascading style sheets,active server pages,dynamic html,internet,database,development,Web building,Webmaster,html guide" />

<meta name="Description" content="Free HTML XHTML CSS JavaScript DHTML XML DOM XSL XSLT RSS AJAX ASP ADO PHP SQL tutorials, references, examples for web building." />

<meta http-equiv="pragma" content="no-cache" />
<meta http-equiv="cache-control" content="no-cache" />

<link rel="stylesheet" type="text/css" href="../stdtheme.css" />

<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "../../https@ssl./default.htm" : "../../www./default.htm");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
var pageTracker = _gat._getTracker("UA-3855518-1");
pageTracker._initData();
pageTracker._trackPageview();
</script>

</head>
<body>

<a name="top"></a>
<table cellpadding="0" cellspacing="0" width="100%" bgcolor="#808080">
<tr>
<td width="234" valign="top">
<a href="../default.htm"><img src="../images/w3default80.jpg" border="0" alt="W3Schools" /></a>
</td>
<th valign="middle" align="left" class="right">
<script type="text/javascript"><!--
google_ad_client = "pub-3440800076797949";
/*txtimg*/
google_ad_slot = "5330033957";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript" src="../../pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
<noscript>
<a href="../default.asp" target="_blank"><img src="../banners/w6.gif" border="0" alt="W3Schools" /></a>
</noscript>

<br /></th>
</tr>
</table>

<table style="margin-left:1px" width="800px" border="0" cellpadding="0" cellspacing="2">
<tr>
<td width="137" class="content" valign="top"><br />
<a class="left" href="../default.asp" target="_top">
<img src="../images/homeicon.gif" border="0" alt="home" /></a>
<a class="left" href="../default.asp" target="_top">
<b>HOME</b></a>
<br /><br />
<b>JS Basic</b>
<br />
<a class="left" target="_top" href="default.asp" >JS HOME</a><br />
<a class="left" target="_top" href="js_intro.asp" >JS Introduction</a><br />
<a class="left" target="_top" href="js_howto.asp" >JS How To</a><br />
<a class="left" target="_top" href="js_whereto.asp" >JS Where To</a><br />
<a class="left" target="_top" href="js_statements.asp" >JS Statements</a><br />
<a class="left" target="_top" href="js_comments.asp" >JS Comments</a><br />
<a class="left" target="_top" href="js_variables.asp" >JS Variables</a><br />
<a class="left" target="_top" href="js_operators.asp" >JS Operators</a><br />
<a class="left" target="_top" href="js_comparisons.asp" style='font-weight:bold;'>JS Comparisons</a><br />
<a class="left" target="_top" href="js_if_else.asp" >JS If...Else</a><br />
<a class="left" target="_top" href="js_switch.asp" >JS Switch</a><br />
<a class="left" target="_top" href="js_popup.asp" >JS Popup Boxes</a><br />
<a class="left" target="_top" href="js_functions.asp" >JS Functions</a><br />
<a class="left" target="_top" href="js_loop_for.asp" >JS For Loop</a><br />
<a class="left" target="_top" href="js_loop_while.asp" >JS While Loop</a><br />
<a class="left" target="_top" href="js_break.asp" >JS Break Loops</a><br />
<a class="left" target="_top" href="js_loop_for_in.asp" >JS For...In</a><br />
<a class="left" target="_top" href="js_events.asp" >JS Events</a><br />
<a class="left" target="_top" href="js_try_catch.asp" >JS Try...Catch</a><br />
<a class="left" target="_top" href="js_throw.asp" >JS Throw</a><br />
<a class="left" target="_top" href="js_onerror.asp" >JS onerror</a><br />
<a class="left" target="_top" href="js_special_characters.asp" >JS Special Text</a><br />
<a class="left" target="_top" href="js_guidelines.asp" >JS Guidelines</a><br />
<br />
<b>JS Objects</b>
<br />
<a class="left" target="_top" href="js_obj_intro.asp" >JS Objects Intro</a><br />
<a class="left" target="_top" href="js_obj_string.asp" >JS String</a><br />
<a class="left" target="_top" href="js_obj_date.asp" >JS Date</a><br />
<a class="left" target="_top" href="js_obj_array.asp" >JS Array</a><br />
<a class="left" target="_top" href="js_obj_boolean.asp" >JS Boolean</a><br />
<a class="left" target="_top" href="js_obj_math.asp" >JS Math</a><br />
<a class="left" target="_top" href="js_obj_regexp.asp" >JS RegExp</a><br />
<a class="left" target="_top" href="js_obj_htmldom.asp" >JS HTML DOM</a><br />
<br />
<b>JS Advanced</b>
<br />
<a class="left" target="_top" href="js_browser.asp" >JS Browser</a><br />
<a class="left" target="_top" href="js_cookies.asp" >JS Cookies</a><br />
<a class="left" target="_top" href="js_form_validation.asp" >JS Validation</a><br />
<a class="left" target="_top" href="js_animation.asp" >JS Animation</a><br />
<a class="left" target="_top" href="js_image_maps.asp" >JS Image Maps</a><br />
<a class="left" target="_top" href="js_timing.asp" >JS Timing</a><br />
<a class="left" target="_top" href="js_objects.asp" >JS Create Object</a><br />
<a class="left" target="_top" href="js_summary.asp" >JS Summary</a><br />
<br />
<b>Examples/Quiz</b>
<br />
<a class="left" target="_top" href="js_examples.asp" >JS Examples</a><br />
<a class="left" target="_top" href="js_examples_2.asp" >JS Object Examples</a><br />
<a class="left" target="_top" href="js_examples_3.asp" >JS DOM Examples</a><br />
<a class="left" target="_top" href="js_quiz.asp" >JS Quiz</a><br />
<br />
<b>JS References</b>
<br />
<a class="left" target="_top" href="../jsref/default.asp" >JS Objects</a><br />
<a class="left" target="_top" href="../htmldom/dom_reference.asp" >JS HTML DOM</a><br />
<br />
<b>Selected Reading</b><br />
<a class="left" target="_top" href="../browsers/browsers_stats.asp">Web Statistics</a><br />
<a class="left" target="_top" href="../site/site_glossary.asp">Web Glossary</a><br />
<a class="left" target="_top" href="../hosting/default.asp">Web Hosting</a><br />
<a class="left" target="_top" href="../quality/default.asp">Web Quality</a><br /><br />
<a class="left" target="_top" href="../forum/default.asp">W3Schools Forum</a><br /><br />
<a class="left" target="_top" href="../about/about_helping.asp">Helping W3Schools</a><br /><br />
<script type="text/javascript"><!--
google_ad_client = "pub-3440800076797949";
/*LeftLinkUnit*/
google_ad_slot = "4854527104";
google_ad_width = 120;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript"
src="../../pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</td>
<td valign="top">
<table style="border: 1px solid gray" width="100%" bgcolor="#FFFFFF" border="0" cellpadding="5" cellspacing="0">
<tr>
<td>

<h1>JavaScript Comparison and Logical Operators</h1>
<a href="js_operators.asp"><img alt="previous" border="0" src="../images/btn_previous.gif" width="100" height="20" /></a>
<a href="js_if_else.asp"><img alt="next" border="0" src="../images/btn_next.gif" width="100" height="20" /></a>
<hr />

<p class="intro">Comparison and Logical operators are used to test for true or 
false.</p>
<hr />

<h2>Comparison Operators</h2>
<p>Comparison operators are used in logical statements to determine equality or 
difference between variables or values. </p>
<p>Given that <b>x=5</b>, the table below explains the comparison operators:</p>

<table class="ex" cellspacing="0" border="1" width="100%" id="table1">

<tr>
<th width="15%" align="left">Operator</th>
<th width="45%" align="left">Description</th>
<th width="40%" align="left">Example</th>
</tr>

<tr>
<td valign="top">==</td>
<td valign="top">is equal to
</td>
<td valign="top">x==8 is false
</td>
</tr>

<tr>
<td valign="top">===</td>
<td valign="top">is exactly equal to (value and type)</td>
<td valign="top">x===5 is true<br />
x===&quot;5&quot; is false</td>
</tr>

<tr>
<td valign="top">!=</td>
<td valign="top">is not equal
</td>
<td valign="top">x!=8 is true
</td>
</tr>

<tr>
<td valign="top">&gt;</td>
<td valign="top">is greater than
</td>
<td valign="top">x&gt;8 is false
</td>
</tr>

<tr>
<td valign="top">&lt;</td>
<td valign="top">is less than
</td>
<td valign="top">x&lt;8 is true</td>
</tr>

<tr>
<td valign="top">&gt;=</td>
<td valign="top">is greater than or equal to
</td>

⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -