abstract：<!DOCTYPE html><html><head> <meta charset="utf-8"> <title></title> <style type="text/css"> a{width:100px;height:100px;border-radius:50px;
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
a{width:100px;height:100px;border-radius:50px;background:red;float:left;line-height:100px;margin-left:30px; text-align: center;text-decoration:none;color: #ccc;}
}
</style>
<script type="text/javascript" src="jq.js"></script>
</head>
<body>
<a href="#">1</a>
<a href="#">2</a>
<a href="#">3</a>
<a href="#">4</a>
</body>
</html>
<script type="text/javascript">
Math.random
Math.floor
function aa(tag) {
var len = document.getElementsByTagName(tag).length
// var a = Math.floor(Math.random()*256)
for (var i = 0; i <len; i++) {
document.getElementsByTagName(tag)[i].style.backgroundColor='rgb('+Math.floor(Math.random()*256)+','+Math.floor(Math.random()*256)+','+Math.floor(Math.random()*256)+')'//獲取隨機(jī)顏色
}
}
$(document).ready(function(){
aa('a')
$('a').mousemove(function(){
$bg = $(this).css('backgroundColor')
$(this).css('box-shadow','0px 0px 20px'+$bg)
$(this).css('border-radius','20px')
})
$('a').mouseleave(function(){
$(this).css('border-radius','50px')
})
})
</script>
Correcting teacher：天蓬老師Correction time：2018-12-17 14:06:06
Teacher's summary：這個(gè)作業(yè) , 重點(diǎn)是考察 原生的Math對(duì)象的使用