模拟选择题多选

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 2 
 3 <script language=javascript>
 4 function changeselect(selectname)
 5 {
 6 answer.innerText=""
 7 for(i=0;i<=yesanswer.length-1;i++)
 8 {
 9     if(yesanswer[i].checked)
10     answer.innerText=answer.innerText+yesanswer[i].value
11 }
12 }
13 </script>
14 鞋垫具有哪些功能　（<span id=answer></span>）<br>
15 <input name="yesanswer" type="checkbox" value="A" onClick="changeselect(this)">
16                                 A.消除脚气脚臭、风湿光节炎痛<br>
17 <input name="yesanswer" type="checkbox" value="B" onClick="changeselect(this)">
18                                 B.促进循环         <br>
19 <input name="yesanswer" type="checkbox" value="C" onClick="changeselect(this)">
20                                 C.A，B答案均是                                              <br>
21 <input name="yesanswer" type="checkbox" value="D" onClick="changeselect(this)">
22                                 D.能强筋健力
23