如何一键实现复选框的全选或取消勾选操作？
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本文共计275个文字，预计阅读时间需要2分钟。
全选与全不选
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>全选与全不选</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.getElementsByTagName("input"); //alert(hobby.length); for(var i= 0,j = 6;i<j;i++) { hobby[i].checked = true; } } function clearall(){ var hobby = document.getElementsByName("hobby"); //alert(hobby.length); for(var i= 0,j=hobby.length;i<j;i++) { hobby[i].checked = false; } } function checkone(){ clearall(); var j=document.getElementById("wb").value; document.getElementById("hobby"+j).checked = true; } </script> </body> </html>
本文共计275个文字，预计阅读时间需要2分钟。
全选与全不选
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>全选与全不选</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.getElementsByTagName("input"); //alert(hobby.length); for(var i= 0,j = 6;i<j;i++) { hobby[i].checked = true; } } function clearall(){ var hobby = document.getElementsByName("hobby"); //alert(hobby.length); for(var i= 0,j=hobby.length;i<j;i++) { hobby[i].checked = false; } } function checkone(){ clearall(); var j=document.getElementById("wb").value; document.getElementById("hobby"+j).checked = true; } </script> </body> </html>