小编也是刚开始学JavaScript，觉得淘宝评星效果很棒，于是产生了自己写一个的想法，先给大家分享一下实现效果：
现附上自己写的源代码
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <script language="JavaScript" type="text/javascript"> function star(n) { var array=new Array(); array[0]=document.getElementById("oneStar"); array[1]=document.getElementById("twoStar"); array[2]=document.getElementById("threeStar"); array[3]=document.getElementById("fourStar"); array[4]=document.getElementById("fiveStar"); for(var i=0;i<=n;i++) { array[i].innerText="★"; } for( var j=4;j>n;j--) { array[j].innerText="☆"; } document.getElementById("evaluate").innerText="您的评价是"+(n+1)+"星"; } </script> <title>评星</title></head><body><strong>请您对我们作出评价:</strong><span id="star"> <span style="cursor: pointer " onclick="star(0)"id="oneStar" >☆</span> <span style="cursor: pointer " onclick="star(1)" id="twoStar" >☆</span> <span style="cursor: pointer " onclick="star(2)" id="threeStar" >☆</span> <span style="cursor: pointer " onclick="star(3)" id="fourStar" >☆</span> <span style="cursor: pointer " onclick="star(4)" id="fiveStar" >☆</span></span><span id="evaluate"></span></body></html>
一开始的时候用了两个for循环就是这样的:
for(var i=0;i<=n;i++) { document.getElementById("fiveStar").innerText="★"; } for( var j=4;j>n;j--) { document.getElementById("fiveStar").innerText="☆"; }
大神们估计已经看出来了,在for循环之后HTML里的span已经失去了作用,也就是说它只能评价一次.....
于是顺着这个思路想到了用数组解决这个问题,就是让评星效果里的每一颗星储存到数组里,写出了上述的代码,可楼主还犯了一个小错误,着实困恼了许久....
array[0]=document.getElementById("oneStar").innerText;
通过这样定义的数组....结果可想而知,后面的代码根本无法改变评星,后来意识到,这样的定义直接将ID为onestar的元素的内容赋值给了数组,也就是说数组成了一个指向数组的指针....自然无法改变对应元素的值.后来总算明白了....
之后又加了一些CSS效果
成品是这样的:
<!DOCTYPE html><head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>淘宝评分效果</title> <style type="text/css"> ul, li {margin: 0; padding: 0; border: 0;} .shop-rating { height: 25px; overflow: hidden; zoom: 1; padding: 2px 0; position: relative; z-index: 999; font:12px Arial; color:#000; line-height:1.2em } .shop-rating span { height: 23px; display: block; line-height: 23px; float: left; } .shop-rating span.title { width: 125px; text-align: right; margin-right: 5px; } .shop-rating ul { float: left; } .shop-rating .result { margin-left: 20px; padding-top: 2px; } .shop-rating .result span { color: #ff6d02; } .rating-level, .rating-level a { background: url(//img.jbzj.com/demoimg/201007/o_star.png) no-repeat scroll 1000px 1000px; } .rating-level { background-position: 0px 0px; width: 120px; height: 23px; position: relative; z-index: 1000; } .shop-rating .result em { color: #f60; font-family: arial; font-weight: bold; } .rating-level li { display: inline; } .rating-level a { line-height: 23px; height: 23px; position: absolute; top: 0px; left: 0px; text-indent: -999em; *zoom: 1; outline: none; } .rating-level a.one-star { width: 20%; z-index: 6; } .rating-level a.two-stars { width: 40%; z-index: 5; } .rating-level a.three-stars { width: 60%; z-index: 4; } .rating-level a.four-stars { width: 80%; z-index: 3; } .rating-level a.five-stars { width: 100%; z-index: 2; } .rating-level .current-rating, .rating-level a:hover {background-position:0 -28px} .rating-level a.one-star:hover,.rating-level a.two-stars:hover,.rating-level a.one-star.current-rating,.rating-level a.two-stars.current-rating{background-position:0 -116px;} .rating-level .three-stars .current-rating,.rating-level .four-stars .current-rating,.rating-level .five-stars .current-rating{background-position:0 -28px;} </style></head><body><div class="shop-rating"> <span class="title">你对我人品的评价:</span> <ul class="rating-level" id="stars2"> <li><a href="javascript:void(0);" class="one-star" star:value="20">20</a></li> <li><a href="javascript:void(0);" class="two-stars" star:value="40">40</a></li> <li><a href="javascript:void(0);" class="three-stars" star:value="60">60</a></li> <li><a href="javascript:void(0);" class="four-stars" star:value="80">80</a></li> <li><a href="javascript:void(0);" class="five-stars" star:value="100">100</a></li> </ul> <span id="stars2-tips" class="result"></span> <input type="hidden" id="stars2-input" name="b" value="" size="2" /></div><script> var TB = function() { var T$ = function(id) { return document.getElementById(id) } var T$$ = function(r, t) { return (r || document).getElementsByTagName(t) } var Stars = function(cid, rid, hid, config) { var lis = T$$(T$(cid), 'li'), curA; for (var i = 0, len = lis.length; i < len; i++) { lis[i]._val = i; lis[i].onclick = function() { T$(rid).innerHTML = '<em>' + (T$(hid).value = T$$(this, 'a')[0].getAttribute('star:value')) + '分</em> - ' + config.info[this._val]; curA = T$$(T$(cid), 'a')[T$(hid).value / config.step - 1]; }; lis[i].onmouseout = function() { curA && (curA.className += config.curcss); } lis[i].onmouseover = function() { curA && (curA.className = curA.className.replace(config.curcss, '')); } } }; return {Stars: Stars} }().Stars('stars2', 'stars2-tips', 'stars2-input', { 'info' : ['人品极差', '人品不咋地', '人品一般吧', '人品不错', '人品极好啊'], 'curcss': ' current-rating', 'step': 20 });</script></body></html>
以上就是JavaScript制作淘宝星级评分效果的思路，语言很直白，易理解，希望对大家的学习有所帮助，和小编一起去探索javascript更多的神奇之处，共同进步。
