效果：
源码：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> *{ margin: 0; padding: 0; } select{ margin-left: 100px; } </style> </head> <body> <input type="checkbox" name="fruit" value="1"><br/> <input type="checkbox" name="fruit" value="1"><br/> <input type="checkbox" name="fruit" value="1"><br/> <input type="checkbox" name="fruit" value="1"><br/> <input type="checkbox" name="fruit" value="1"><br/> <input type="checkbox" name="fruit" value="1"><br/> <input type="checkbox" name="fruit" value="1"><br/> <input type="checkbox" name="fruit" value="1"><br/> <input type="checkbox" name="fruit" value="1"><br/> <button type="button" onclick="selectAll()">全选</button> <button type="button" onclick="unSelectAll()">全不选</button> <button type="button" onclick="converSelectAll()">反选</button> <script type="text/javascript"> var inputs = document.getElementsByTagName("input"); function selectAll(){ for(var i = 0;i<inputs.length;i++){ inputs[i].checked = true; } } function unSelectAll(){ for(var i = 0;i<inputs.length;i++){ inputs[i].checked = false; } } function converSelectAll(){ for(var i = 0;i<inputs.length;i++){ if(inputs[i].checked){ inputs[i].checked = false; }else{ inputs[i].checked = true; } } } </script> </body> </html>