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javascript基础

javascript 
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>JavaScript页面</title>
<script language="javascript">
var myName = "isaac";
document.write(myName);
</script>
</head>

<body>
<p>正文内容</p>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>slice()和substring()</title>
<script language="javascript">
var sMyString = "Tsinghua University";
document.write(sMyString.slice(1,3) + "<br>");
document.write(sMyString.substring(1,3) + "<br>");
document.write(sMyString.slice(4) + "<br>");
document.write(sMyString + "<br>");		//不改变原字符串
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>slice()和substring()的区别</title>
<script language="javascript">
var sMyString = "Tsinghua University";
document.write(sMyString.slice(2,-3) + "<br>");
document.write(sMyString.substring(2,-3) + "<br>");
document.write(sMyString.substring(2,0) + "<br>");
document.write(sMyString + "<br>");
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>indexOf()和lastIndexOf()</title>
<script language="javascript">
var sMyString = "Tsinghua University";
document.write(sMyString.indexOf("i")+"<br>");		//从前往后
document.write(sMyString.indexOf("i",3)+"<br>");		//可选参数，从第几个字符开始往后找
document.write(sMyString.lastIndexOf("i")+"<br>");	//从后往前
document.write(sMyString.lastIndexOf("i",3)+"<br>");	//可选参数，从第几个字符开始往前找
document.write(sMyString.lastIndexOf("V")+"<br>");	//大写“V”找不到，返回-1
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>数值计算</title>
<script language="javascript">
var mynum1 = 23.345;
var mynum2 = 45;
var mynum3 = -34;
var mynum4 = 9e5;		//科学计数法
alert(mynum1 + " " + mynum2 + " " + mynum3 + " " + mynum4);
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>数值计算</title>
<script language="javascript">
var fNumber = 895.4;
alert(fNumber.toExponential(1));
alert(fNumber.toExponential(2));
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>布尔型</title>
<script language="javascript">
var married = true;
alert("1." + typeof(married));
married = "true";
alert("2." + typeof(married));
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>类型转换</title>
<script language="javascript">
var a = 3;
var b = a + "";
var c = a.toString();
var d = "student" + a;
alert(typeof(a) + " " + typeof(b) + " " + typeof(c) + " " + typeof(d));
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>toString()方法</title>
<script language="javascript">
var a=11;
document.write(a.toString(2) + "<br>");
document.write(a.toString(3) + "<br>");
document.write(a.toString(8) + "<br>");
document.write(a.toString(16) + "<br>");
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>parseInt()方法</title>
<script language="javascript">
document.write(parseInt("4567red") + "<br>");
document.write(parseInt("53.5") + "<br>");
document.write(parseInt("0xC") + "<br>");	//直接进制转换
document.write(parseInt("isaacshun@gmail.com") + "<br>");
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>parseInt()方法</title>
<script language="javascript">
document.write(parseInt("AF",16) + "<br>");
document.write(parseInt("11",2) + "<br>");
document.write(parseInt("011") + "<br>");		//0开头，默认为八进制
document.write(parseInt("011",8) + "<br>");
document.write(parseInt("011",10) + "<br>");	//指定为十进制
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>parseFloat()方法</title>
<script language="javascript">
document.write(parseFloat("34535orange") + "<br>");
document.write(parseFloat("0xA") + "<br>");	//不再有默认进制，直接输出第一个字符“0”
document.write(parseFloat("435.34") + "<br>");
document.write(parseFloat("435.34.564") + "<br>");
document.write(parseFloat("isaacshun@gmail.com") + "<br>");
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>数组</title>
<script language="javascript">
var aMap = new Array("China","USA","Britain");
alert(aMap.length + " " + aMap[2]);
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>数组</title>
<script language="javascript">
var aMap = new Array("China","USA","Britain");
aMap[20] = "Korea";
alert(aMap.length + " " + aMap[10] + " " + aMap[20]);
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>数组</title>
<script language="javascript">
var aMap = ["China","USA","Britain"];
aMap[20] = "Korea";
alert(aMap.length + " " + aMap[10] + " " + aMap[20]);
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>数组</title>
<script language="javascript">
var aMap = ["China","USA","Britain"];
alert(aMap.toString() + " " + typeof(aMap.toString()));
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>join()方法</title>
<script language="javascript">
var aMap = ["China","USA","Britain"];
document.write(aMap.join() + "<br>");			//无参数，等同于toString()
document.write(aMap.join("") + "<br>");		//不用连接符
document.write(aMap.join("][") + "<br>");		//用“][”来连接
document.write(aMap.join("-isaac-") + "<br>");
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>split()方法</title>
<script language="javascript">
var sFruit = "apple,pear,peach,orange";
var aFruit = sFruit.split(",");
alert(aFruit.join("--"));
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>reverse()方法</title>
<script language="javascript">
var aFruit = ["apple","pear","peach","orange"];
alert(aFruit.reverse().toString());
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>字符串的reverse()</title>
<script language="javascript">
var sMyString = "abcdefg";
alert(sMyString.split("").reverse().join(""));
/*	split("")将每一个字符转为一个数组元素
reverse()反序数组的每个元素
join("")再最后将数组无连接符的转为字符串
*/
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>sort()方法</title>
<script language="javascript">
var aFruit = ["pear","apple","peach","orange"];
aFruit.sort();
alert(aFruit.toString());
</script>
</head>

<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>ջ</title>
<script language="javascript">
var stack = new Array();
stack.push("red");
stack.push("green");
stack.push("blue");
document.write(stack.toString() + "<br>");
var vItem = stack.pop();
document.write(vItem + "<br>");
document.write(stack.toString());
</script>
</head>
<body>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<body>
<script language="javascript">
document.write("Pear" == "Pear");
document.write("<br>");
document.write("Apple" < "Orange");
document.write("<br>");
document.write("apple" < "Orange");
</script>
</body>
</html>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<body>
<script language="javascript">
document.write(3>2 && 4>3);
document.write("<br>");
document.write(3>2 && 4<3);
document.write("<br>");
document.write(4<3 || 3>2);
document.write("<br>");
document.write(!(3>2));
</script>
</body>
</html>



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

<body>
<script language="javascript">
//首先获取用户的一个输入，并用Number()强制转换为数字
var iNumber = Number(prompt("输入一个5到100之间的数字", ""));
if(isNaN(iNumber))		//判断输入的是否是数字
	document.write("请确认你的输入正确");
else if(iNumber > 100 || iNumber < 5)		//判断输入的数字范围
	document.write("你输入的数字范围不在5和100之间");
else
	document.write("你输入的数字是:" + iNumber);
</script>
</body>
</html>



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

<body>
<script language="javascript">
iWeek = parseInt(prompt("输入1到7之间的整数",""));
switch(iWeek){
	case 1:
		document.write("Monday");
		break;
	case 2:
		document.write("Tuesday");
		break;
	case 3:
		document.write("Wednesday");
		break;
	case 4:
		document.write("Thursday");
		break;
	case 5:
		document.write("Friday");
		break;
	case 6:
		document.write("Saturday");
		break;
	case 7:
		document.write("Sunday");
		break;
	default:
		document.write("Error");
}
</script>
</body>
</html>




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

<body>
<script language="javascript">
var i=iSum=0;
while(i<=100){
	iSum += i;
	i++;
}
alert(iSum);
</script>
</body>
</html>




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

<body>
<script language="javascript">
var aNumbers = new Array();
var sMessage = "你输入了:\n";
var iTotal = 0;
var vUserInput;
var iArrayIndex = 0;
do{
	vUserInput = prompt("输入一个数字，或者'0'退出","0");
	aNumbers[iArrayIndex] = vUserInput;
	iArrayIndex++;
	iTotal += Number(vUserInput);
	sMessage += vUserInput + "\n";
}while(vUserInput != 0)		//当输入为0（默认值）时退出循环体
sMessage += "总数:" + iTotal;
alert(sMessage);
</script>
</body>
</html>




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

<body>
<script language="javascript">
var aNumbers = new Array();
var sMessage = "你输入了:\n";
var iTotal = 0;
var vUserInput;
var iArrayIndex = 0;
do{
	vUserInput = prompt("输入一个数字，或者'0'退出","0");
	aNumbers[iArrayIndex] = vUserInput;
	iArrayIndex++;
}while(vUserInput != 0)		//当输入为0（默认值）时退出循环体
//for循环遍历数组的常用方法：
for(var i=0;i<aNumbers.length;i++){
	iTotal += Number(aNumbers[i]);
	sMessage += aNumbers[i] + "\n";
}
sMessage += "总数:" + iTotal;
alert(sMessage);
</script>
</body>
</html>




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

<body>
<script language="javascript">
var aNumbers = new Array();
var sMessage = "你输入了:<br>";
var iTotal = 0;
var vUserInput;
var iArrayIndex = 0;
do{
	vUserInput = Number(prompt("输入一个数字，或者'0'退出","0"));
	if(isNaN(vUserInput)){
		document.write("输入错误，请输入数字，'0'退出<br>");
		break;		//输入错误直接退出整个do循环体
	}
	aNumbers[iArrayIndex] = vUserInput;
	iArrayIndex++;
}while(vUserInput != 0)		//当输入为0（默认值）时退出循环体
//for循环遍历数组的常用方法：
for(var i=0;i<aNumbers.length;i++){
	iTotal += Number(aNumbers[i]);
	sMessage += aNumbers[i] + "<br>";
}
sMessage += "总数:" + iTotal;
document.write(sMessage);
</script>
</body>
</html>




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

<body>
<script language="javascript">
var aNumbers = new Array();
var sMessage = "你输入了:<br>";
var iTotal = 0;
var vUserInput;
var iArrayIndex = 0;
do{
	vUserInput = Number(prompt("输入一个数字，或者'0'退出","0"));
	if(isNaN(vUserInput)){
		alert("输入错误，请输入数字，'0'退出");
		continue;		//输入错误则退出当前循环，继续下一次循环
	}
	aNumbers[iArrayIndex] = vUserInput;
	iArrayIndex++;
}while(vUserInput != 0)		//当输入为0（默认值）时退出循环体
//for循环遍历数组的常用方法：
for(var i=0;i<aNumbers.length;i++){
	iTotal += Number(aNumbers[i]);
	sMessage += aNumbers[i] + "<br>";
}
sMessage += "总数:" + iTotal;
document.write(sMessage);
</script>
</body>
</html>




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>九九乘法表</title>
</head>

<body bgcolor="#e0f1ff">
<table cellpadding="6" cellspacing="0" style="border-collapse:collapse; border:none;">
<script language="javascript">
for(var i=1;i<10;i++){			//乘法表一共九行
	document.write("<tr>");		//每行是table的一行
    for(j=1;j<10;j++)			//每行都有9个单元格
		if(j<=i)				//有内容的单元格
	        document.write("<td style='border:2px solid #004B8A; background:#FFFFFF;'>"+i+"*"+j+"="+(i*j)+"</td>");
		else					//没有内容的单元格
			document.write("<td style='border:none;'></td>");
    document.write("</tr>");
}
</script>
</table>
</body>
</html>




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>arguments.length</title>
<script language="javascript">
function ArgsNum(){
	return arguments.length;
}
document.write(ArgsNum("isaac",25) + "<br>");
document.write(ArgsNum() + "<br>");
document.write(ArgsNum(3) + "<br>");
</script>
</head>

<body>
</body>
</html>




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>arguments</title>
<script language="javascript">
function fnAdd(){
	if(arguments.length == 0)
		return;
	else if(arguments.length == 1)
		return arguments[0] + 5;
	else{
		var iSum = 0;
		for(var i=0;i<arguments.length;i++)
			iSum += arguments[i];
		return iSum;
	}
}
document.write(fnAdd(45) + "<br>");
document.write(fnAdd(45,50) + "<br>");
document.write(fnAdd(45,50,55,60) + "<br>");
</script>
</head>

<body>
</body>
</html>




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>杨辉三角</title>
<script language="javascript">
function Combination(m,n){
	if(n==0) return 1;			//每行第一个数为1
	else if(m==n) return 1;	//最后一个数为1
	//其余都是上一行相邻元素相加而来
	else return Combination(m-1,n-1)+Combination(m-1,n);
}
function Pascal(n){	//杨慧三角，n为行数
	for(var i=0;i<n;i++){		//一共n行
		for(var j=0;j<=i;j++)	//每行数字的个数即为行号，例如第一行1个数，第二行2个数
			document.write(Combination(i,j)+"&nbsp;&nbsp;");
		document.write("<br>");
	}		
}
Pascal(10);		//直接传入希望得到的杨辉三角的行数
</script>
</head>

<body>
</body>
</html>




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Date对象</title>
<script language="javascript">
var myDate1 = new Date();	//运行代码前的时间
for(var i=0;i<3000000;i++);
var myDate2 = new Date();	//运行代码后的时间
alert(myDate2-myDate1);
</script>
</head>

<body>
</body>
</html>




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Date对象</title>
<script language="javascript">
var oMyDate = new Date();
var iYear = oMyDate.getFullYear();
var iMonth = oMyDate.getMonth() + 1;	//月份是从0开始的
var iDate = oMyDate.getDate();
var iDay = oMyDate.getDay();
switch(iDay){
	case 0:
		iDay = "星期日";
		break;
	case 1:
		iDay = "星期一";
		break;
	case 2:
		iDay = "星期二";
		break;
	case 3:
		iDay = "星期三";
		break;
	case 4:
		iDay = "星期四";
		break;
	case 5:
		iDay = "星期五";
		break;
	case 6:
		iDay = "星期六";
		break;
	default:
		iDay = "error";
}
document.write("今天是" + iYear + "年" + iMonth +"月" + iDate + "日," + iDay);
</script>
</head>

<body>
</body>
</html>




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Date对象</title>
<script language="javascript">
function disDate(oDate, iDate){
	var ms = oDate.getTime();		//换成毫秒数
	ms -= iDate*24*60*60*1000;		//计算相差的毫秒数
	return new Date(ms);			//返回新的时间对象
}
var oBeijing = new Date(2008,7,8);
var iNum = 100;						//前100天
var oMyDate = disDate(oBeijing, iNum);
document.write(oMyDate.getFullYear()+"年"+(oMyDate.getMonth()+1)+"月"+oMyDate.getDate()+"日" + "距离"+oBeijing.getFullYear()+"年"+(oBeijing.getMonth()+1)+"月"+oBeijing.getDate()+"日为"+iNum+"天");
</script>
</head>

<body>
</body>
</html>




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Math.random()</title>
<script language="javascript">
function selectFrom(iFirstValue, iLastValue){
	var iChoices = iLastValue - iFirstValue + 1;	//计算项数
	return Math.floor(Math.random()*iChoices+iFirstValue);
}
var iNum = selectFrom(2,99);		//随机选择数字
var aFruits = ["apple","pear","peach","orange","watermelon","banana"];
//随机选择数组元素
var sFruit = aFruits[selectFrom(0,aFruits.length-1)];
alert(iNum + " " + sFruit);
</script>
</head>

<body>
</body>
</html>




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>检测浏览器和操作系统</title>
<script language="javascript">
var sUserAgent = navigator.userAgent;
//检测Opera、KHTML
var isOpera = sUserAgent.indexOf("Opera") > -1;
var isKHTML = sUserAgent.indexOf("KHTML") > -1 || sUserAgent.indexOf("Konqueror") > -1 || sUserAgent.indexOf("AppleWebKit") > -1;
//检测IE、Mozilla
var isIE = sUserAgent.indexOf("compatible") > -1 && sUserAgent.indexOf("MSIE") > -1 && !isOpera;
var isMoz = sUserAgent.indexOf("Gecko") > -1 && !isKHTML;
//检测操作系统
var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");
var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh");
var isUnix = (navigator.platform == "X11") && !isWin && !isMac;
if(isOpera) document.write("Opera ");
if(isKHTML) document.write("KHTML ");
if(isIE) document.write("IE ");
if(isMoz) document.write("Mozilla ");
if(isWin) document.write("Windows");
if(isMac) document.write("Mac");
if(isUnix) document.write("Unix");
</script>
</head>

<body>
</body>
</html>
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