<script type="text/javascript">
function init() {
var ctx = document.getElementById('stars').getContext('2d')
ctx.fillStyle = "#827839"
ctx.shadowColor="#000000"
ctx.shadowOffsetX=6
ctx.shadowOffsetY=6
ctx.shadowBlur=9
ctx.beginPath()
ctx.moveTo(15, 150)
ctx.lineTo(100,140)
ctx.lineTo(170,90)
ctx.lineTo(230,140)
ctx.lineTo(315,150)
ctx.lineTo(230,200)
ctx.lineTo(300,263)
ctx.lineTo(170,233)
ctx.lineTo(30,263)
ctx.lineTo(100,200)
ctx.closePath()
ctx.fill()
}
window.addEventListener('load', init, false)
</script>
<canvas id="stars" width="333" height="300">
Your browser does not support the canvas element .
</canvas>
下面是js 的评分实现,每次评分都是整数,4.2只是个平均值用这个就可以了
SELECT avg(star) as stars FROM content where id =100
只有一个数值,就是你要的平均分,也就是4.2
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=utf-8" />
<title>星级评分系统</title>
<style>
body,div,ul,li,p{margin:0padding:0}
body{color:#666font:12px/1.5 Arial}
ul{list-style-type:none}
#star{position:relativewidth:600pxmargin:10px auto}
#star ul,#star span{float:leftdisplay:inlineheight:19pxline-height:19px}
#star ul{margin:0 10px}
#star li{float:leftwidth:24pxcursor:pointertext-indent:-9999pxbackground:url(/jscss/demoimg/201206/star.png) no-repeat}
#star strong{color:#f60padding-left:10px}
#star li.on{background-position:0 -28px}
#star p{position:absolutetop:20pxwidth:159pxheight:60pxdisplay:nonebackground:url(/jscss/demoimg/201206/icon.gif) no-repeatpadding:7px 10px 0}
#star p em{color:#f60display:blockfont-style:normal}
</style>
<script type="text/javascript">
window.onload = function ()
{
var oStar = document.getElementById("star")
var aLi = oStar.getElementsByTagName("li")
var oUl = oStar.getElementsByTagName("ul")[0]
var oSpan = oStar.getElementsByTagName("span")[1]
var oP = oStar.getElementsByTagName("p")[0]
var i = iScore = iStar = 0
var aMsg = [
"很不满意|差得太离谱，与卖家描述的严重不符，非常不满",
"不满意|部分有破损，与卖家描述的不符，不满意",
"一般|质量一般，没有卖家描述的那么好",
"满意|质量不错，与卖家描述的基本一致，还是挺满意的",
"非常满意|质量非常好，与卖家描述的完全一致，非常满意"
]
for (i = 1i <= aLi.lengthi++)
{
aLi[i - 1].index = i
//鼠标移过显示分数
aLi[i - 1].onmouseover = function ()
{
fnPoint(this.index)
//浮动层显示
oP.style.display = "block"
//计算浮动层位置
oP.style.left = oUl.offsetLeft + this.index * this.offsetWidth - 104 + "px"
//匹配浮动层文字内容
oP.innerHTML = "<em><b>" + this.index + "</b>分 " + aMsg[this.index - 1].match(/(.+)\|/)[1] + "</em>" + aMsg[this.index - 1].match(/\|(.+)/)[1]
}
//鼠标离开后恢复上次评分
aLi[i - 1].onmouseout = function ()
{
fnPoint()
//关闭浮动层
oP.style.display = "none"
}
//点击后进行评分处理
aLi[i - 1].onclick = function ()
{
iStar = this.index
oP.style.display = "none"
oSpan.innerHTML = "<strong>" + (this.index) + " 分</strong>(" + aMsg[this.index - 1].match(/\|(.+)/)[1] + ")"
}
}
//评分处理
function fnPoint(iArg)
{
//分数赋值
iScore = iArg || iStar
for (i = 0i <aLi.lengthi++) aLi[i].className = i <iScore ? "on" : ""
}
}
</script>
</head>
<body>
<div id="star">
<span>点击星星就能打分</span>
<ul>
<li><a href="javascript:">1</a></li>
<li><a href="javascript:">2</a></li>
<li><a href="javascript:">3</a></li>
<li><a href="javascript:">4</a></li>
<li><a href="javascript:">5</a></li>
</ul>
<span></span>
<p></p>
</div>
</body>
</html>
