***页面背景***用几个rodio组合在一起，可以用来代替水平线
把下列代码加到网页的<body></body>标签之间 从google下载我的照片管理软件要完成此效果需要两个步骤
第一步：把如下代码加入到<head>区域中
<!--
// 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.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>
第二步：把“onload="animate()"”加在<body>标记里
例如：<body onload="animate()">
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