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如何为豆瓣FM写一个chrome的歌词插件

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对于喜欢豆瓣FM的同学来说,没有歌词是件令人苦恼的事,下面我就来总结下怎样为豆瓣FM写一个chrome的歌词插件。

———————————

1.需要的技能

首先,你要会javascript,其次你要掌握一点chrome的hack,最后要有一个可以根据歌曲名查到歌词的API。

2.localStorage

localStorage与cookie类似,它是存储在客户端浏览器中的数据,它与cookie不同的一点是它没有时间限制。localStorage属于html5中的新特性。因为我们要做chrome的插件,所以按F12弹出开发者模式,点击resource,就可以看见localstorage选项了,通过localStorage,我们可以得到当前豆瓣播放的歌曲的id,歌曲名,演唱者等信息:

rrr1

3.歌词迷的API

请求地址: http://geci.me/api/lyric/:song
返回格式: JSON
请求方法: GET
示例:
curl 'http://geci.me/api/lyric/海阔天空'

返回:

{
"count": 15,
"code": 0,
"result": [
{ "aid": 2848529, "lrc": "http://s.geci.me/lrc/344/34435/3443588.lrc", "sid": 3443588,
"artist_id": 2, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 2346662, "lrc": "http://s.geci.me/lrc/274/27442/2744281.lrc", "sid": 2744281,
"artist_id": 2396, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 1889264, "lrc": "http://s.geci.me/lrc/210/21070/2107014.lrc", "sid": 2107014,
"artist_id": 8715, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 2075717, "lrc": "http://s.geci.me/lrc/236/23651/2365157.lrc", "sid": 2365157,
"artist_id": 8715, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 1563419, "lrc": "http://s.geci.me/lrc/166/16685/1668536.lrc", "sid": 1668536,
"artist_id": 9208, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 1567586, "lrc": "http://s.geci.me/lrc/167/16739/1673997.lrc", "sid": 1673997,
"artist_id": 9208, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 1571906, "lrc": "http://s.geci.me/lrc/167/16796/1679605.lrc", "sid": 1679605,
"artist_id": 9208, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 1573814, "lrc": "http://s.geci.me/lrc/168/16819/1681961.lrc", "sid": 1681961,
"artist_id": 9208, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 1656038, "lrc": "http://s.geci.me/lrc/179/17907/1790768.lrc", "sid": 1790768,
"artist_id": 9208, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 1718741, "lrc": "http://s.geci.me/lrc/187/18757/1875769.lrc", "sid": 1875769,
"artist_id": 9208, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 2003267, "lrc": "http://s.geci.me/lrc/226/22642/2264296.lrc", "sid": 2264296,
"artist_id": 9208, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 2020610, "lrc": "http://s.geci.me/lrc/228/22889/2288967.lrc", "sid": 2288967,
"artist_id": 9208, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 2051678, "lrc": "http://s.geci.me/lrc/233/23323/2332322.lrc", "sid": 2332322,
"artist_id": 9208, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 2412704, "lrc": "http://s.geci.me/lrc/283/28376/2837689.lrc", "sid": 2837689,
"artist_id": 9208, "song": "u6d77u9614u5929u7a7a" },
{ "aid": 2607041, "lrc": "http://s.geci.me/lrc/311/31116/3111659.lrc", "sid": 3111659,
"artist_id": 9208, "song": "u6d77u9614u5929u7a7a" }
]
}

4.重头戏—-javascript脚本

有了上面的准备工作,我们现在就可以安心的编码了。

首先,创建一个DoubanFM伪类(javascript中没有“真正的”类)

funciton DoubanFM() {
this.name = '豆瓣FM';
this.tmp_song_id = '';
this.flag = 1;
this.lyrics = this.draw_lyrics();
}

然后,对这个伪类拓展原型,创建新的函数:

【注】关于javascript拓展函数原型,我原来写过一篇博客:http://blog.csdn.net/wusuopubupt/article/details/14520209

用javascript创建新的节点(一个显示歌词的div,同时设置div的css):

DoubanFM.prototype.draw_lyrics = funciton() {
var lyrics_div = document.createElement('div');//用document.createElement()
方法可以创造新的节点
document.body.appendChild(lyrics_div);//用document.body.appendChild()
方法把新的节点附加到到document中
lyrics_div.style.width = '900px';//下面几行是设置css
lyrics_div.style.backgroundColor = '#F00';
lyrics_div.style.zIndex = '42';
lyrics_div.style.position = 'relative';
lyrics_div.style.margin = '200px auto 0';

return lyrics_div;
}

根据localstorage里获取的信息,构造获取歌词的url:

DoubanFM.prototype.geci_entry_url = function(song, artist) {
if (song == undefined || song == null || song == '') return '';
var url = 'http://geci.me/api/lyric/' + song;
if (!(artist == undefined || artist == null || artist == '')) {
url += '/' + artist;
}
console.log(url);
return url;
}

用AJAX方式异步请求歌词:

Douban.prototype.request_geci = function() {
eval('var stored_song = ' + localStorage['bubbler_song_info']);//
这里是重点,localstorage!
console.log('the song in localStorage:' + stored_song.artist + ' '
+ stored_song.song_name);
if (this.tmp_song_id != stored_song.id) {
console.log(this.tmp_song_id + ' is not ' + stored_song.id);
var url = this.geci_entry_url(stored_song.song_name, stored_song.artist);
this.tmp_song_id = stored_song.id;
this.ajax_get(url);
}
}

ajax请求

DoubanFM.prototype.ajax_get = function(url) {
var XHR = new XMLHttpRequest();
var obj = this;
//一次典型的原生js发起的AJAX请求
XHR.onreadystatechange = function() {
if (XHR.readyState == 4) {
if (XHR.status == 200) {
obj.deal_response(XHR.responseText);
} else {
obj.print_lyrics('获取歌词失败');
}
} else {
obj.print_lyrics('歌词搜索中');
}
}

XHR.open('GET', url, true);
XHR.send();
}

DoubanFM.prototype.deal_response = function(data) {
if (this.flag == 1) {
eval('var resp = ' + data);
if (resp.count > 0) {
this.ajax_get(resp.result[0].lrc);
this.flag++;
} else {
this.print_lyrics('没有找到歌词');
}
} else {
this.print_lyrics(this.format(data));
this.ajax_flag = 1;
}
}

 

对返回的歌词做处理:
DoubanFM.prototype.format = function(text) {
var s = text.replace(/[(.*)]/g, '').trim();//去除返回数据的[]两端的内容,只保留歌词部分
return s.replace(/n/g, 'n<br />');//每行末尾输出html的换行符
}
把format过后的歌词显示在上面用document.createElement()方法创建出来的div中:
DoubanFM.prototype.print_lyrics = function(text) {
this.lyrics.innerHTML = '<div id="mylrc" style="width: 490px; max-height: 280px;
padding:10px; background-color: #9dd6c5; z-index: 42;
po<span style="white-space:pre"> </span>sition: absolute; right: 0;
overflow-x: hidden; overflow-y: scroll; display: block;">'+ text +'</div>';
}
最后,用setInterval()方法,每隔一秒执行就获取歌词的方法,实现豆瓣FM歌词的更新和显示:
var fm = new DoubanFM(true);
window.setInterval(function() { fm.request_geci(); }, 1000);
至此,javascript的工作就完成

5.还需要什么?

写一个chrome的插件,你还需要一个manifest.json文件,类似这样:

{
"name" : "Douban FM 歌词",
"version" : "1.0",
"manifest_version" : 2,
"description" : "Douban FM Lrc",

"page_action" : {
"default_icon" : "icon.png",
"default_title" : "Douban FM 歌词"
},

"permissions" : ["tabs", "http://douban.fm/", "http://*.geci.me/*"],
"background" : {"scripts" : ["background.js"]},
"content_scripts" : [{
"matches" : ["http://douban.fm/"],
"js" : ["lyrics.js"],
"runat" : "document_end"
}],
"icons" : {
"48" : "icon-48.png",
"128" : "icon-128.png"
}
}

还需要几个不同size的icon,类似这样:

32

最后,到chrome的拓展程序(直接在地址栏输入:chrome://extensions/),选择“打包拓展程序”,然后把我们的整个程序的文件夹选中,即可生成一个.crx文件,拖进chrome,即可安装。

:如果你想好好学下如何制作chrome的拓展,可以看这篇文章:http://www.cnblogs.com/walkingp/archive/2011/03/31/2001628.html

6.最后的效果

 在我们的拓展程序中,可以看到:

18

 

再进入豆瓣FM,听听歌,哦,我看到歌词啦!

11

7.参考 

1).http://www.v2ex.com/t/54570

2).http://www.douban.com/note/282160723/?type=like

 

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