Sincerajn
2017-08-24 23:45
<!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"); // 任务1 for(i = 0;i < hobby.length;i++){ if(hobby[i].type == "checkbox"){ hobby[i].checked = true; } } } function clearall(){ var hobby = document.getElementsByName("hobby"); // 任务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; if(j<1||j>6){ alert("无效的数值") } else{ var hobby = document.getElementById("hobby"+ j ); hobby.checked = true; } } // 任务3 </script> </body> </html>
("hobby"+ j ) 这个什么意思
好丢人啊……我想发代码的怎么成这样了
JavaScript进阶篇
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