<!DOCTYPE HTML><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>无标题文档</title> </head> <body> <form> 请选择你爱好:<br> <input type="checkbox" name="hobby" id="hobby1"> 音乐 <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"> 阅读 <input type="checkbox" name="hobby" id="hobby5"> 打球 <input type="checkbox" name="hobby" id="hobby6"> 跑步 <br> <input type="button" value = "全选" onclick = "checkall();"> <input type="button" value = "全不选" onclick = "clearall();"> <p>请输入您要选择爱好的序号，序号为1-6:</p> <input id="wb" name="wb" type="text" > <input name="ok" type="button" value="确定" onclick = "checkone();"> </form> <script type="text/javascript"> function checkall(){ var hobby = document.getElementsByTagName("input"); for(i = 0;i < hobby.length;i++){ if(hobby[i].type == "checkbox"){ hobby[i].checked = true; } } } function clearall(){aaaa var hobby = document.getElementsByName("hobby"); for(i = 0;i < hobby.length;i++){ hobby[i].checked = false;} } function checkone(){ var j=document.getElementById("wb").value; var hobby = document.getElementById("hobby"+j); 这一句话是什么意思？ hobby.checked = true; } </script> </body></html>
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