JavaScript基础

// JavaScript Document

function al()

    {

alert("hello")

    }



function number()

    {

prompt("输个数字进来哦","只能是数字哦")

    }



function shuzi()  //是数字返回false,不是数字返回true.

{

var a;

var b=prompt("输个数字进来吧","只能是数字啊");

    a=isNaN(b);

    {

    alert(a);

    }        

}



function shuzu()//定义数组

{

var ab=new Array();

ab[0]=123;

ab[1]="ab";

document.write(ab)}
<!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>无标题文档</title>

<script src="5-15.js" type="text/javascript" language="javascript">

</script>

</head>



<body>

<input type="button" onclick="al()" value="hello"><br>

<input type="button" onclick="number()" value="数字"><br>

<input type="button" onclick="shuzi()" value="判断是否为数字"><br>

<input type="button" onclick="shuzu()" value="获取数组里面的值"><br>

 



</body>

</html>

 

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