请问咋在页面中就没显示啊?
<!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=gb2312" />
<title>无标题文档</title>
<script language="javascript">
var num1="100";
var num2="200";
document.write("num1='100' num2='200'");
var result=Number(num1)+Number(num2);
document.write("<br>数值的运算结果为:",result);
var st=String(num1);
resule=st+200;
document.write("<br>字符窜与数值的运算结果为:",result);
var bo=Boolean(num1);
result=bo+num2;
document.write("<br>字符窜与布尔值的运算结果为:",result);
result=bo+200;
document.write("<br>数值与字符窜的运算结果为:",result);
</script>
</head>
<body>
</body>
</html>