我是javasript初学者,大家帮忙看下我的代码有什么问题,我看了好长时间都看不出来,大家帮下忙
<html>
<title>if...else练习</title>
<head>
<script type="text/javascript">
function disp_propmt() {
var name =prompt("请输入您的姓名" " ")
var sex =prompt("性别" "男")
if (name != null && name!=" ")
{
if (sex =="男")
{
alert(name+"先生你好\n祝您玩的愉快")
}
else if (sex == "女")
{
alert(name+"女士你好\n 祝您越来越漂亮”)
}
else {
alert(name+"您是火星人吗?\n 祝您在地球玩的愉快")
}
}
}
</script>
</head>
<body>
<input type="button" value="单击这里" onclick="disp_propmt()">
</body>
</html>
<html>
<title>if...else练习</title>
<head>
<script type="text/javascript">
function disp_propmt() {
var name =prompt("请输入您的姓名" " ")
var sex =prompt("性别" "男")
if (name != null && name!=" ")
{
if (sex =="男")
{
alert(name+"先生你好\n祝您玩的愉快")
}
else if (sex == "女")
{
alert(name+"女士你好\n 祝您越来越漂亮”)
}
else {
alert(name+"您是火星人吗?\n 祝您在地球玩的愉快")
}
}
}
</script>
</head>
<body>
<input type="button" value="单击这里" onclick="disp_propmt()">
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>if...else练习</title>
<script type="text/javascript">
function disp_propmt() {
var name = prompt("请输入您的姓名","");
var sex = prompt("性别","男");
if (name != null && name!=""){
if (sex =="男"){
alert(name+"先生你好\n祝您玩的愉快");
}
else if(sex == "女"){
alert(name+"女士你好\n 祝您越来越漂亮");
}
else{
alert(name+"您是火星人吗?\n 祝您在地球玩的愉快");
}
}
}
</script>
</head>
<body>
<input type="button" value="单击这里" onclick="disp_propmt()">
</body>
</html>
<!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">
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<head>
<title>if...else练习</title>
<script src="jquery-1.3.2.js"></script><script>
$(document).ready(function(){
$("#btn").click(function(){
var name = prompt("请输入您的姓名","");
var sex = prompt("性别","男");
if (name != null && name!=""){
if (sex =="男"){
alert(name+"先生你好\n祝您玩的愉快");
}
else if(sex == "女"){
alert(name+"女士你好\n 祝您越来越漂亮");
}
else{
alert(name+"您是火星人吗?\n 祝您在地球玩的愉快");
}
}
});
});
</script>
</head>
<body>
<input id="btn" type="button" value="单击这里">
</body>
</html>jquery的