代码如下： <!--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>
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