<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>全选和全不选</title> <script> function selectAll(){ var check1 = document.getElementById("checkbox1"); //var checks = document.getElementsByTagName("input"); var checks = document.getElementsByName("checkbox1"); for(var i=1;i<checks.length;i++){ checks[i].checked = check1.checked; } } </script> </head> <body> <table> <tr> <td><input type="checkbox" name="checkbox1" id="checkbox1" onclick="selectAll()"></td> </tr> <tr> <td><input type="checkbox" name="checkbox1"></td> </tr> <tr> <td><input type="checkbox" name="checkbox1"></td> </tr> <tr> <td><input type="checkbox" name="checkbox1"></td> </tr> <tr> <td><input type="checkbox" name="checkbox1"></td> </tr> </table> </body> </html>