练习一:输入答案,弹出是否正确。
<!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>
</head> <body> <form>中国成立于哪一年?<input type="text" daan="1949年" id="t" name="t"/>
<input type="button" onclick="check()" id="t1" name="t1" value="检查答案"/>
</form> </body>
</html>
<script>
function check()
{
var a=document.getElementById("t");
var b=a.value;
var c=a.getAttribute("daan");
if(b==c)
{
alert("恭喜您答对了!");
}
else
{
alert("对不起,您回答错了!");
}
}
</script>
练习二:倒计时10秒,设置同意按钮,10秒倒计时结束是按钮可用,否则不能用,这里用操作属性:disable改变按钮状态,当disable="disable"时,按钮不可用。
<!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>
</head> <body>
<form><input type="submit" id="t" name="t" value="同意(10)" disabled="disabled" /></form> </body>
</html>
<script type="application/javascript" >
var n=10;
var a=document.getElementById("t");
function miao()
{
n--;
if(n==0)
{
a.removeAttribute("disabled");
a.value="同意";
return;
}
else
{
a.value="同意("+n+")";
window.setTimeout("miao()",1000);
}
}
window.setTimeout("miao()",1000); </script>