这里有新鲜出炉的 Javascript 教程,程序狗速度看过来!
Javascript 是一种由 Netscape 的 LiveScript 发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如 Perl,遗留的速度问题,为客户提供更流畅的浏览效果。
这篇文章主要介绍了 JavaScript 制作淘宝星级评分效果的整个思考过程,思路很清晰,并附带了完整的程序源码,感兴趣的小伙伴们可以参考一下
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(http://files.phperz.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。
来源: http://www.phperz.com/article/17/0408/268606.html