Tip: you can modify some code before running
<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>Check box select all, do not select all, and select inverse effects</title><SCRIPT LANGUAGE="JavaScript"><!-- Beginfunction checkAll() {for (var j = 1; j <= 9; j++) {box = eval("document.checkboxform.C" + j); if (box.checked == false) box.checked = true; }}function uncheckAll() {for (var j = 1; j <= 9; j++) {box = eval("document.checkboxform.C" + j); if (box.checked == true) box.checked = false; }}function switchAll() {for (var j = 1; j <= 9; j++) {box = eval("document.checkboxform.C" + j); box.checked = !box.checked; }}// End --></script></head><body><form name=checkboxform><input type=checkbox name=C1 checked>C1<br><input type=checkbox name=C2 checked>C2<br><input type=checkbox name=C3 checked>C3<br><input type=checkbox name=C4 checked>C4<br><input type=checkbox name=C5 checked>C5<br><input type=checkbox name=C6 checked>C6<br><input type=checkbox name=C7 checked>C7<br><input type=checkbox name=C8 checked>C8<br><input type=checkbox name=C9 checked>C9<br><br><input type=button value="全部选中" onClick="checkAll()"><br><input type=button value="全部不选" onClick="uncheckAll()"><br><input type=button value="选择转换" onClick="switchAll()"><br></form></body></html>
Tip: you can modify some code before running