用几个Rodio组合在一起，可以用来代替水平线
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<!-- 把下面的代码加到<HEAD></HEAD>区域中： -->
<script>
// create row of radio buttons
lay(20)
// set index of lamp to start animation
var current = 0
// set speed (pause in milliseconds between each movement)
var speed = 50
function lay(num) {
// assign "greater than" character to variable
var gt = unescape("%3e")
// open form
document.write("<center><FORM NAME='animation'" + gt)
// use loop to lay radio buttons down (all buttons in same group)
for (var i = 0; i < num; ++i) {
document.write("<INPUT TYPE='radio' NAME='lamps'" + gt)
}
// close form
document.write("</FORM" + gt)
}
function animate() {
// click next radio button
document.animation.lamps[current].click()
// if radio button is the last one reset variable to 0 (otherwise increment)
current = (current == document.animation.lamps.length - 1) ? 0 : ++current
// recursive call after speed milliseconds
timerID = setTimeout("animate()", speed)
}
</script>
<!-- 第 2 步： -->
<!-- 把<BODY>中的属性代码改为： -->
<BODY onLoad="animate()">
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