如何用JavaScript做出淘寶評星效果

秦至發表於2015-11-24
JavaScript

樓主也是剛開始學JavaScript,覺得淘寶評星效果很棒,於是產生了自己寫一個的想法 現附上樓主自己寫的原始碼 ``` <!DOCTYPE html> 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="您的評價是"+(n+1)+"星"; } 評星 請您對我們作出評價: ☆ ☆ ☆ ☆ ☆

**樓主剛開始的時候將用了兩個for迴圈就是這樣的:** for(var i=0;i<=n;i++) { document.getElementById("fiveStar").innerText="★"; } for( var j=4;j>n;j--) { document.getElementById("fiveStar").innerText="☆"; } 大神們估計已經看出來了,在for迴圈之後HTML裡的span已經失去了作用,也就是說它只能評價一次..... **於是樓主順著這個思路想到了用陣列解決這個問題,就是讓評星效果裡的每一顆星儲存到陣列裡,寫出了上述的程式碼,可樓主還犯了一個小錯誤,著實困惱了許久....** array[0]=document.getElementById("oneStar").innerText; 樓主這樣定義的陣列....結果可想而知,後面的程式碼根本無法改變評星,後來樓主想明白了,這樣的定義直接將ID為onestar的元素的內容賦值給了陣列,也就是說陣列成了一個指向陣列的指標....自然無法改變對應元素的值. **後來樓主就算是頓悟了....** 之後又加了一些CSS效果 **成品是這樣的:** <!DOCTYPE html> 淘寶評分效果 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;}

你對我人品的評價:
  • 20
  • 40
  • 60
  • 80
  • 100
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$(cid), 'li'), curA; for (var i = 0, len = lis.length; i ' + (T$(hid).value = T$$(this, 'a')[0].getAttribute('star:value')) + '分 - ' + config.info[this._val]; curA = T$$(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' : ['人品極差', '人品不咋地', '人品一般吧', '人品不錯', '人品極好啊'], 'curcss': ' current-rating', 'step': 20 });

``` Happy hacking!

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