下列js代码中checkone（）函数代码块求解！ - 知否问答 - 万象云+社区

<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>DOM 全选、取消全选</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.getElementsByName("hobby"); for(var i=0;i<hobby.length;i++){ hobby[i].checked=true; //复选框选中状态 } } function clearall(){ var hobby = document.getElementsByName("hobby"); //alert(hobby.length); for(var i=0;i<hobby.length;i++){ hobby[i].checked=false; } } function checkone(){ //这段代码的理解？？？ clearall(); var hobby = document.getElementsByName("hobby"); var j=document.getElementById("wb").value; for(var i=0;i<j.length;i++){ if(j.charAt(i)>6 || j.charAt(i)<1){ alert("越界,请重新输入！"); document.getElementById("wb").value=""; } } for(var n=0;n<j.length;n++){ hobby[(j.charAt(n))-1].checked=true; } } </script> </body> </html>

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