?1
?2 < head >
?3 < SCRIPT?LANGUAGE = " JavaScript " >
?4 <!-- //
?5 function ?checkChoice(field,?i)? {
?6 if ?(i? == ? 0 )? {
?7 ???? // ?"All"?被選中了;則將其它所有選項(xiàng)都被選中;
?8 ???? if ?(field[ 0 ].checked? == ? true )? {
?9 ???????? for ?(i? = ? 1 ;?i? < ?field.length;?i ++ )
10 ????????field[i].checked? = ? true ;
11 ????} else ? if (field[ 0 ].checked? == ? false ) {
12 ???????? for ?(i? = ? 1 ;?i? < ?field.length;?i ++ )
13 ????????field[i].checked? = ? false ;
14 ????????}
15 ????}
16 else ? if ?(i? != ? 0 ) {
17 ???? // 否則，只要其它任意項(xiàng)目被不選中，則將ALL的選擇狀態(tài)(field[0])設(shè)置為false(未被選中)
18
19 ????? if (?field[i].checked? == ? false ) {
20
21 ????????field[ 0 ].checked? = ? false ;?
22 ????????}
23 ?????}
24 }
25 // -->
26 </ script >
27 </ head >
28 < body >
29
30
31
32 < form?name = pickform?method = " post " ?action = " . " >
33 < table?width = " 201 " >
34 < tr >
35 < td > 你最喜歡什么課程？ </ td >
36 </ tr >
37 < tr >
38 < td >
39 < input?type = checkbox?name = classes?value = " all " ?onClick = " checkChoice(document.pickform.classes,?0) " ? >
40 All? < br >
41 < input?type = checkbox?name = classes?value = " 數(shù)學(xué) " ?onClick = " checkChoice(document.pickform.classes,?1) " >
42 數(shù)學(xué) < br >
43 < input?type = checkbox?name = classes?value = " 語(yǔ)文 " ?onClick = " checkChoice(document.pickform.classes,?2) " >
44 語(yǔ)文? < br >
45 < input?type = checkbox?name = classes?value = " 英語(yǔ) " ?onClick = " checkChoice(document.pickform.classes,?3) " >
46 英語(yǔ) < br >
47 < input?type = checkbox?name = classes?value = " 生物 " ?onClick = " checkChoice(document.pickform.classes,?4) " >
48 生物 < br >
49 < input?type = checkbox?name = classes?value = " 歷史 " ?onClick = " checkChoice(document.pickform.classes,?5) " >
50 歷史 </ td >
51 </ tr >
52 < tr >
53 < td >
54 < input?type = " button " ?name = " Button " ?value = " Button " ?onClick = " javascript:alert('使用時(shí)將action指向處理表單的程序！') " >
55 </ td >
56 </ tr >
57 </ table >
58 </ form >
59 </ body >