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任務三，換個思路出不來結果？請大神幫忙看看

看到答案內容很簡潔，用switch判斷很繁瑣。但非常好奇為什么用switch的寫法無法正常顯示？

ture寫錯了，已改正，但還是無法顯示？？

黑羊sparrow

2015-03-08

源自：JavaScript進階篇 9-4

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3 回答

sanguoyou
2015-03-10

<!DOCTYPE HTML>
<html>
??? <head>
??????? <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
??????? <title>無標題文檔</title>
??? </head>
?? ?
??? <body>
??????? <form>
????????? 請選擇你愛好:<br>
????????? <input type="checkbox" name="hobby" id="hobby1">? 音樂
????????? <input type="checkbox" name="hobby" id="hobby2">? 登山
????????? <input type="checkbox" name="hobby" id="hobby3">? 游泳
????????? <input type="checkbox" name="hobby" id="hobby4">? 閱讀
????????? <input type="checkbox" name="hobby" id="hobby5">? 打球
????????? <input type="checkbox" name="hobby" id="hobby6">? 跑步 <br>
????????? <input type="button" value = "全選" onclick = "checkall();">
????????? <input type="button" value = "全不選" onclick = "clearall();">
????????? <p>請輸入您要選擇愛好的序號，序號為1-6:</p>
????????? <input id="wb" name="wb" type="text" >
????????? <input name="ok" type="button" value="確定" onclick = "checkone();">
??????? </form>
??????? <script type="text/javascript">
??????? function checkall(){
??????????? var hobby = document.getElementsByTagName("input");
??????? // 任務1
??????? for(i=0;i<hobby.length;i++){
??????? if(hobby[i].type=="checkbox"){
??????? hobby[i].checked=true;
??????? }
??????? }
??? }
??????? function clearall(){
??????????? var hobby = document.getElementsByName("hobby");
?????????? ?
???????? // 任務2?? ?
??????? for(i=0;i<hobby.length;i++){
??????? if(hobby[i].type=="checkbox"){
??????? hobby[i].checked=false;
??????? }
??????? }?? ?
??????? }
?????? ?
??????? function checkone(){
??????? var j=document.getElementById("wb").value;
???????? // 任務3
??????? switch(j){
??????? case "1": document.getElementById("hobby1").checked=true;
??????? break;
??????? case "2": document.getElementById("hobby2").checked=true;? ?
??????? break;
??????? case "3": document.getElementById("hobby3").checked=true;? ?
??????? break;
??????? case "4": document.getElementById("hobby4").checked=true;? ?
??????? break;
??????? case "5": document.getElementById("hobby5").checked=true;? ?
??????? break;
??????? case "6": document.getElementById("hobby6").checked=true;? ?
??????? break;
??????? }
??????? }
??????? </script>
??? </body>
</html>