发布于 2015-11-24 09:58:12 | 190 次阅读 | 评论: 0 | 来源: PHPERZ
这里有新鲜出炉的Javascript教程，程序狗速度看过来！
JavaScript客户端脚本语言
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。
楼主也是刚开始学JavaScript,觉得淘宝评星效果很棒,于是产生了自己写一个的想法
现附上楼主自己写的源代码
<!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>
楼主刚开始的时候将用了两个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.....
于是楼主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;
楼主这样定义的数组....结果可想而知,后面的代码根本无法改变评星,后来楼主想明白了,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.
后来楼主就算是顿悟了....
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.jb51.net/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>
Happy hacking!