菜鸟学习javascript实例教程

时间:2010-03-23 19:41:19  来源:第二电脑网  作者:第二电脑网

  第二电脑网导读:式化文本的例子:<html><body><script type="text/javascript">document.write("<h1>Hello World!</h1>")</script></body></html>书写JS位置的例子:打开页面弹出窗口的例子<html><head><script type="text/j...
  正文:

用JS显示文字的例子:

<html>
<body>

<script type="text/JavaScript">
document.write("Hello World!")
</script>

</body>
</html>

用HTML标签来格式化文本的例子:

<html>
<body>

<script type="text/javascript">
document.write("<h1>Hello World!</h1>")
</script>

</body>
</html>

书写JS位置的例子:

打开页面弹出窗口的例子

<html>
<head>
<script type="text/javascript">
function message()
{
alert("网页教学网欢迎你的光临")
}
</script>
</head>

<body onload="message()">

</body>
</html>


在BODY区内输出显示文本的例子:

<html>
<head>
</head>

<body>

<script type="text/javascript">
document.write("欢迎光临网页教学网http://www.webjx.com")
</script>

</body>
</html>


调用其它的一个JS文件的例子:

<html>
<head>
</head>
<body>

<script src="xxx.js">
</script>

<p>
The actual script is in an external script file called "xxx.js".
</p>

</body>
</html>


变量的使用


变量使用的例子:


<html>
<body>

<script type="text/javascript">
var name = "Hege"
document.write(name)
document.write("<h1>"+name+"</h1>")
</script>

<p>This example declares a variable, assigns a value to it, and then displays the variable.</p>

<p>Then the variable is displayed one more time, only this time as a heading.</p>

</body>
</html>


函数的例子

函数使用的一个例子:

<html>
<head>

<script type="text/javascript">
function myfunction()
{
alert("HELLO")
}
</script>

</head>
<body>

<form>
<input type="button"
onclick="myfunction()"
value="Call function">
</form>

<p>By pressing the button, a function will be called. The function will alert a message.</p>

</body>
</html>

带一个参数的函数的例子:

<html>
<head>

<script type="text/javascript">
function myfunction(txt)
{
alert(txt)
}
</script>

</head>
<body>

<form>
<input type="button"
onclick="myfunction('Hello')"
value="Call function">
</form>

<p>By pressing the button, a function with an argument will be called. The function will alert
this argument.</p>

</body>
</html>

不同的两个参数调用函数的例子:

<html>
<head>
<script type="text/javascript">
function myfunction(txt)
{
alert(txt)
}
</script>
</head>

<body>
<form>
<input type="button"
onclick="myfunction('Good Morning!')"
value="In the Morning">

<input type="button"
onclick="myfunction('Good Evening!')"
value="In the Evening">
</form>

<p>
When you click on one of the buttons, a function will be called. The function will alert
the argument that is passed to it.
</p>

</body>
</html>

利用函数返回值的例子:

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