📄 c11_21.htm
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>练习题一 </title>
<script language="javascript">
function getLayer(name){
var layer = null;
if(document.layers)
eval("layer = document.layer["+name+"];");
else if( document.all)
eval("layer = document.all."+name+".style;");
return layer;
}
function init(){
cor1=getLayer("cor1div");
err1=getLayer("err1div");
hint=getLayer("hintdiv");
answer=getLayer("answerdiv");
errortimes=0;
}
function show(obj){
obj.display='block';
}
function hide(obj){
obj.display='none';
}
function judge1(){
var s1=document.form.C1.checked;
var s2=document.form.C2.checked;
var s3=document.form.C3.checked;
var s4=document.form.C4.checked;
var s5=document.form.C5.checked;
var s6=document.form.C6.checked;
var s7=document.form.C7.checked;
var s8=document.form.C8.checked;
var s9=document.form.C9.checked;
var s=s1&&(!s2)&&s3&&s4&&(!s5)&&s6&&(!s7)&&(s8)&&(!s9);
if(s){
errortimes=0;
hide(answer);
hide(hint);
hide(err1);
show(cor1);
}else{
errortimes++;
if(errortimes==3) show(hint);
hide(cor1);
show(err1);
}
}
</script>
</head>
<body bgcolor="#ccefcc" onLoad="init()">
<blockquote>
<p>这里给出了几个标识符,其中有一些是正确的,有一些是错误的。请选出正确的标识符编号。
</p>
<form name="form">
<p>1. <input type="checkbox" name="C1" value="ON">Hot_dog <br>
2. <input type="checkbox" name="C2" value="ON">$z^** <br>
3. <input type="checkbox" name="C3" value="ON">cat1<br>
4. <input type="checkbox" name="C4" value="ON">a11<br>
5. <input type="checkbox" name="C5" value="ON">SUM#<br>
6. <input type="checkbox" name="C6" value="ON">Dollar<br>
7. <input type="checkbox" name="C7" value="ON">2dog<br>
8. <input type="checkbox" name="C8" value="ON">S_exp<br>
9. <input type="checkbox" name="C9" value="ON">^pointer
<input type="button" value="确认" name="B1" onClick="judge1()"></p>
</form>
<div id="cor1div" style="display:'none'" visibility="hide"><p><font color="#FF0000">做的好!</font></p>
</div><div id="err1div" style="display:'none'"><p><font color="#FF0000">对不起!
你选错了。</font></p>
</div><div id="hintdiv" style="display:'none'"><p><a href="javascript:show(answer)">这里</a>看正确答案!</p>
<div id="answerdiv" style="display:'none'"><p>正确的标识符编号是:1, 3, 4, 6, 8</p>
</div></div>
</blockquote>
<p align="center"><a href="javascript:close()">关闭</a></p>
</body>
</html>
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