效果图：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <script> function clickon() { // 获取到body中所有checkbox var checkbox = document.querySelectorAll("input[type='checkbox']"); for (var i = 0; i < checkbox.length; i++) { checkbox[i].checked = true; } } function unclick() { var checkbox = document.querySelectorAll("input[type='checkbox']"); for (var i = 0; i < checkbox.length; i++) { checkbox[i].checked = false; } } </script> <body> <form> <input type="checkbox">吃 <input type="checkbox">喝 <input type="checkbox">拉 <input type="checkbox">撒 <input type="button" value="全选" onclick="clickon()"> <input type="button" value="全不选" onclick="unclick()"> </form> </body> </html>