<!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>
<title>5-11</title>
</head>
<body>
<script language="javascript">
try
{
var n = error; // 人为引发一个错误
}
catch( e )
{
alert( (e.number&0xFFFF) + "号错误：" + e.description );// 错误处理：仅输出错误信息
}
</script>
</body>
</html>
out
<!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>
<title>5-12</title>
</head>
<body>
<script language="javascript">
try
{
var fruit = new Array( "鸭梨", "苹果", "葡萄", "李子" ); // 水果
for( n=0; n<fruit.length; m++ ) // 遍历数组，在此人为引发一个异常
{
document.write( fruit[n] + " " );
}
}
catch( e )
{
alert( (e.number&0xFFFF) + "号错误：" + e.description ); // 处理异常
}
finally // finally块中清除数组所占的资源
{
fruit = null;
alert( "fruit="+fruit+"已经断开fruit数组的引用！");
}
</script>
</body>
</html>
除数为0异常
<!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>
<title>5-13</title>
</head>
<body>
<script language="javascript">
try
{
var total = 100;
var parts = 0;
if( parts == 0 ) // 如果除数为0则抛出异常
{
throw "Error:parts is zero";
}
alert( "每人"+total/parts+"份"); //此处将捕获try块中抛出的异常
}
catch( e )
{
alert( e );
}
</script>
</body>
</html>
