// <![CDATA[
var musicPlayer = function() {
 			return this.init.apply(this, arguments);
 		};

 		musicPlayer.prototype = {
 			constructor: musicPlayer,
 			init:function(options) {
 				if(isEmptyObj(options) || typeof options !== 'object') return;
 				this.player = options.player;
 				this.lrc = options.lrc;
 				this.lrcArea = options.lrcArea;
 				//用于保存歌词
 				this.lrcArr = [];
 				//用于保存时间戳
 				this.timestamp = [];
 				//处理歌词
 				this.handleLrc(this.lrc);
 				var that = this;

 				this.player.addEventListener('play', function() {
 					that.play();
 				}, false);

 				this.player.addEventListener('pause',function() {
 					that.pause();
 				}, false);

 				//歌词索引
 				this.idx = 0;
 			},
 			//格式化歌词
 			handleLrc:function(lrc) {
 				var re = /(\[.+\])(.+)?/gm,
 					ul = cEl('ul'),
 					frag = document.createDocumentFragment(),
 					tmpArr,i,len;
 				this.lrcArea.innerHTML = '';
 				frag.appendChild(ul);
 				ul.id = 'c';
 				this.lrcArea.appendChild(frag);

 				var	txt = lrc.replace(re,function(a,b,c) {
					return b + (c === undefined ? '&nbsp;' : c) + '\n';
				});

				tmpArr = txt.split('\n');

				//处理歌词
				for(i = 0,len = tmpArr.length; i < len; i++) {
					var item = trim(tmpArr[i]);
					if(item.length > 0) {
						this.lrcArr.push(item);
					}
				}
				
				frag = document.createDocumentFragment();

				for(i = 0,len = this.lrcArr.length; i < len; i++) {
					var li = cEl('li');
					if(i === 0) {
						li.className = 'cur';
					}
					li.innerHTML = this.lrcArr[i].replace(/\[.+\]/i,'')
.replace('// ]]>','').replace('//','');
					//处理时间
					this.timestamp.push(this.lrcArr[i].replace(re,function(a,b,c) {
						return b;
					}).replace('[','').replace(']',''));
					frag.appendChild(li);
				}

				ul.appendChild(frag);
				this.li = g('lrcArea').getElementsByTagName('li');
 			},
 			//播放
 			play:function() {
 				this.stop = false;
 				var that = this,
 					player = this.player,
 					i,len;

 				this.t = setInterval(function() {
 					if(that.stop) return;
 					that.curTime = player.currentTime;

 					for(i = 0,len = that.timestamp.length - 1; i < len; i++) {
 						var	prevTime = that.formatTimeStamp( that.timestamp[i] ),
 							nextTime = that.formatTimeStamp( that.timestamp[i + 1] );
 						//当前播放时间与前后歌词时间比较，如果位于这两者之间则转到该歌词
 						if( parseFloat( that.curTime ) > prevTime && parseFloat( that.curTime ) < nextTime ) {
 							that.scrollToLrc(i);
 							return;
 						}
 					}
 				},300);
 			},
 			//暂停
 			pause:function() {
 				this.stop = true;
 				clearInterval(this.t);
 			},
 			//格式化时间
 			formatTimeStamp:function(timestamp) {
 				var re = /([0-9]+):([0-9]+)\.([0-9]+)/i,
 					seconds = timestamp.replace(re,function(a,b,c,d) {
 						return Number(b * 60) + Number(c) + parseFloat('0.'+ d);
 					});
 				return seconds; 
 			},
 			//歌词滚动
 			scrollToLrc:function(idx) {
 				var ds = getOffset(this.li[idx]).top,
 					i,len;
 				//如果歌词索引没有变动，则认为这句没有唱完，不处理
 				if(this.idx === idx) return;
 				//否则更新索引值并更新样式和位置
 				this.idx = idx;
 				for(i = 0,len = this.li.length; i < len; i++) {
 					this.li[i].className = '';
 				}
 				this.li[idx].className = 'cur';
 				this.lrcArea.scrollTop = ds - this.lrcArea.offsetHeight / 2;
 			}
 		};

 		function g(id) {
 			return typeof id === 'string' ? document.getElementById(id) : id;
 		}
 		function cEl(el) {
 			return document.createElement(el);
 		}
 		function trim(str) {
 			return str.replace(/(^\s*)|(\s*$)/g, "");
 		}
 		function isEmptyObj(o) {
 			for(var p in o) return false;
			return true;
 		}
 		function getOffset(el) {
 			var parent = el.offsetParent,
 				left = el.offsetLeft,
 				top = el.offsetTop;

 			while(parent !== null) {
 				left += parent.offsetLeft;
 				top += parent.offsetTop;
 				parent = parent.offsetParent;
 			}

 			return {
 				left: left,
 				top: top
 			};
 		}

 		var p = new musicPlayer({
 			player: g('player'),
 			lrc: g('lrc').innerHTML,
 			lrcArea: g('lrcArea')
 		});
// ]]>