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脚本说明:
第一步:把如下代码加入＜head＞区域中
＜SCRIPT LANGUAGE="JavaScript"＞
＜!-- Original: Tomer Shiran
＜!-- This script and many more are available free online at --＞
＜!-- The JavaScript Source!! http://javascript.internet.com --＞
＜!-- Begin
var total = 0
var play = false
function display(element) {
var now = new Date()
if (!play) {
play = true
startTime = now.getTime()}
if (now.getTime() - startTime ＞ 20000) {
element.checked = !element.checked
return
}
if (element.checked)
total++
else
total--
element.form.num.value = total
}
function restart(form) {
total = 0
play = false
for (var i = 1; i ＜= 100; ++i) {
form.elements[i].checked = false
}
}
// End --＞
＜/SCRIPT＞
第二步:把如下代码加入＜body＞区
＜CENTER＞Test your skill. How many boxes can
you check in 20 seconds?＜/CENTER＞
＜SCRIPT LANGUAGE="JavaScript"＞
＜!-- Begin
document.write("＜FORM＞＜CENTER＞")
document.write('＜INPUT TYPE="text" VALUE="0" ');
document.write('NAME="num" SIZE=10 onFocus="this.blur()"＞＜BR＞')
document.write("＜HR SIZE=1 WIDTH=40%＞")
for (var i = 0; i ＜ 10; ++i) {
for (var j = 0; j ＜ 10; ++j) {
document.write('＜INPUT TYPE="checkbox" ');
document.write('onClick="display(this)"＞')}
document.write("＜BR＞")}
document.write("＜HR SIZE=1 WIDTH=40%＞")
document.write('＜INPUT TYPE="button" VALUE="restart" ');
document.write('onClick="restart(this.form)"＞')
document.write("＜/CENTER＞＜/FORM＞")
// End --＞
＜/SCRIPT＞ | 
