花花丹的代码

2-10 我或你都可以 (逻辑或操作符）

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>逻辑或</title>

<script type="text/javascript">

var numa,numb,jq1;

numa=50;

numb=55;

jq1=numa>numb||numa==numb          ;

document.write("jq1的值是:"+jq1+"<br>")

</script>

</head>

<body>

</body>

</html>

2015-04-24 查看完整代码

2-9 我与你同在(逻辑与操作符）

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>逻辑与</title>

<script type="text/javascript">

 var numa,numb;

 numa=60;

 numb=70;

 if(numa>=60 && numb>=60          )

  {

  document.write("JavaScript考核通过！"+"<br>");

  }

</script>

</head>

<body>

</body>

</html>

2015-04-24 查看完整代码

2-8 较量较量(比较操作符)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>比较操作符</title>

<script type="text/javascript">

var numa,numb,jq1,jq2;

numa=1;

numb=7;

jq1=numa>numb         ;

jq2=numa!=numb         ;

document.write("numa大于numb的分数吗？"+jq1+"<br>")

document.write("numa不等于numb的分数吗？"+ jq2);

</script>

</head>

<body>

</body>

</html>

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2-7 自加一，自减一 ( ++和- -)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>++/--</title>

<script type="text/javascript">

var numa=1;

var numb=7;

numa++;

numb--;

document.write("numa的值:"+numa);

document.write("numb的值:"+numb);

</script>

</head>

<body>

</body>

</html>

2015-04-24 查看完整代码

2-6 我还有其它用途( +号操作符）

<!DOCTYPE HTML>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>+操作符</title>

<script type="text/javascript">

  var mynum=1+5         ;

  var mychar="中"+"国"         ;

  document.write("mynum的值:"+mynum+"<br>");

  document.write("mychar的值:"+mychar);

</script>

</head>

<body>

</body>

</html>

2015-04-24 查看完整代码

2-5 表达出你的想法(表达式)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>表达式</title>

<script type="text/javascript">

    var num1=10-5;

    var num2=num1+6;

  document.write("小明还剩:"+num1+"元"+"<br>");

  document.write("小红花:"+num2+"元买个铅笔盒");

</script>

</head>

<body>

</body>

</html>

2015-04-24 查看完整代码

2-4 多样化的我(变量赋值）

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>变量赋值</title>

<script type="text/javascript">

var num1=10;

var num2="JS";

 document.write("num1的值是:"+num1);

 document.write("num2的值是:"+num2);

</script>

</head>

<body>

</html>

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2-3 确定你的存在(变量声明)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>声明变量</title>

<script type="text/javascript">

  var mya;

  mya=5;

  alert("mya的值是:"+mya);

</script>

</head>

<body>

</body>

</html>

2015-04-24 查看完整代码

2-2 给变量取个名字(变量命名)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>变量命名</title>

<script type="text/JavaScript">

var myname;

</script>

</head>

<body>

</body>

</html>

2015-04-24 查看完整代码

2-1 什么是变量

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1-2 编程练习

<!DOCTYPE HTML>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>系好安全带,准备启航</title>

<!--引入外部文件的方式-->



<script type="text/javascript">

//多行注释

  /*我是多行注释！

  我需要隐藏，

  否则会报错哦！*/



//在页面中显示文字

document.write("系好安全带,准备启航--目标JS");



//页面中弹出提示框

alert("准备好了，起航吧！");



//单行注释

   //我是单行注释，我也要隐藏起来！



</script>

</head>

<body>

</body>

</html>

2015-04-24 查看完整代码

1-1 让你认识JS

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>我们互动下</title>

<script type="text/javascript">

    document.write("JS进阶篇");

    alert("关注JS高级篇");

</script>

</head>

<body>

</body>

</html>

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