text: /**
   * 选择列表插件
   * varstion 2.0.0
   * by Houfeng
   * Houfeng@DCloud.io
   */
  (function($, window, document, undefined) {
  	var MAX_EXCEED = 30;
  	var VISIBLE_RANGE = 90;
  	var DEFAULT_ITEM_HEIGHT = 40;
  	var BLUR_WIDTH = 10;
  
  	var rad2deg = $.rad2deg = function(rad) {
  		return rad / (Math.PI / 180);
  	};
  
  	var deg2rad = $.deg2rad = function(deg) {
  		return deg * (Math.PI / 180);
  	};
  
  	var platform = navigator.platform.toLowerCase();
  	var userAgent = navigator.userAgent.toLowerCase();
  	var isIos = (userAgent.indexOf('iphone') > -1 ||
  			userAgent.indexOf('ipad') > -1 ||
  			userAgent.indexOf('ipod') > -1) &&
  		(platform.indexOf('iphone') > -1 ||
  			platform.indexOf('ipad') > -1 ||
  			platform.indexOf('ipod') > -1);
  	//alert(isIos);
  
  	var Picker = $.Picker = function(holder, options) {
  		var self = this;
  		self.holder = holder;
  		self.options = options || {};
  		self.init();
  		self.initInertiaParams();
  		self.calcElementItemPostion(true);
  		self.bindEvent();
  	};
  
  	Picker.prototype.findElementItems = function() {
  		var self = this;
  		self.elementItems = [].slice.call(self.holder.querySelectorAll('li'));
  		return self.elementItems;
  	};
  
  	Picker.prototype.init = function() {
  		var self = this;
  		self.list = self.holder.querySelector('ul');
  		self.findElementItems();
  		self.height = self.holder.offsetHeight;
  		self.r = self.height / 2 - BLUR_WIDTH;
  		self.d = self.r * 2;
  		self.itemHeight = self.elementItems.length > 0 ? self.elementItems[0].offsetHeight : DEFAULT_ITEM_HEIGHT;
  		self.itemAngle = parseInt(self.calcAngle(self.itemHeight * 0.8));
  		self.hightlightRange = self.itemAngle / 2;
  		self.visibleRange = VISIBLE_RANGE;
  		self.beginAngle = 0;
  		self.beginExceed = self.beginAngle - MAX_EXCEED;
  		self.list.angle = self.beginAngle;
  		if (isIos) {
  			self.list.style.webkitTransformOrigin = "center center " + self.r + "px";
  		}
  	};
  
  	Picker.prototype.calcElementItemPostion = function(andGenerateItms) {
  		var self = this;
  		if (andGenerateItms) {
  			self.items = [];
  		}
  		self.elementItems.forEach(function(item) {
  			var index = self.elementItems.indexOf(item);
  			self.endAngle = self.itemAngle * index;
  			item.angle = self.endAngle;
  			item.style.webkitTransformOrigin = "center center -" + self.r + "px";
  			item.style.webkitTransform = "translateZ(" + self.r + "px) rotateX(" + (-self.endAngle) + "deg)";
  			if (andGenerateItms) {
  				var dataItem = {};
  				dataItem.text = item.innerHTML || '';
  				dataItem.value = item.getAttribute('data-value') || dataItem.text;
  				self.items.push(dataItem);
  			}
  		});
  		self.endExceed = self.endAngle + MAX_EXCEED;
  		self.calcElementItemVisibility(self.beginAngle);
  	};
  
  	Picker.prototype.calcAngle = function(c) {
  		var self = this;
  		var a = b = parseFloat(self.r);
  		//直径的整倍数部分直接乘以 180
  		c = Math.abs(c); //只算角度不关心正否值
  		var intDeg = parseInt(c / self.d) * 180;
  		c = c % self.d;
  		//余弦
  		var cosC = (a * a + b * b - c * c) / (2 * a * b);
  		var angleC = intDeg + rad2deg(Math.acos(cosC));
  		return angleC;
  	};
  
  	Picker.prototype.calcElementItemVisibility = function(angle) {
  		var self = this;
  		self.elementItems.forEach(function(item) {
  			var difference = Math.abs(item.angle - angle);
  			if (difference < self.hightlightRange) {
  				item.classList.add('highlight');
  			} else if (difference < self.visibleRange) {
  				item.classList.add('visible');
  				item.classList.remove('highlight');
  			} else {
  				item.classList.remove('highlight');
  				item.classList.remove('visible');
  			}
  		});
  	};
  
  	Picker.prototype.setAngle = function(angle) {
  		var self = this;
  		self.list.angle = angle;
  		self.list.style.webkitTransform = "perspective(1000px) rotateY(0deg) rotateX(" + angle + "deg)";
  		self.calcElementItemVisibility(angle);
  	};
  
  	Picker.prototype.bindEvent = function() {
  		var self = this;
  		var lastAngle = 0;
  		var startY = null;
  		var isPicking = false;
  		self.holder.addEventListener($.EVENT_START, function(event) {
  			console.log('EVENT_START');
  			isPicking = true;
  			event.preventDefault();
  			self.list.style.webkitTransition = '';
  			startY = (event.changedTouches ? event.changedTouches[0] : event).pageY;
  			lastAngle = self.list.angle;
  			self.updateInertiaParams(event, true);
  		}, false);
  		self.holder.addEventListener($.EVENT_END, function(event) {
  			console.log('EVENT_END')
  			isPicking = false;
  			event.preventDefault();
  			self.startInertiaScroll(event);
  		}, false);
  		self.holder.addEventListener($.EVENT_CANCEL, function(event) {
  			isPicking = false;
  			event.preventDefault();
  			self.startInertiaScroll(event);
  		}, false);
  		self.holder.addEventListener($.EVENT_MOVE, function(event) {
  			console.log('EVENT_MOVE');
  			if (!isPicking) {
  				return;
  			}
  			event.preventDefault();
  			var endY = (event.changedTouches ? event.changedTouches[0] : event).pageY;
  			var dragRange = endY - startY;
  			var dragAngle = self.calcAngle(dragRange);
  			var newAngle = dragRange > 0 ? lastAngle - dragAngle : lastAngle + dragAngle;
  			if (newAngle > self.endExceed) {
  				newAngle = self.endExceed
  			}
  			if (newAngle < self.beginExceed) {
  				newAngle = self.beginExceed
  			}
  			self.setAngle(newAngle);
  			self.updateInertiaParams(event);
  		}, false);
  		//--
  		self.list.addEventListener('tap', function(event) {
  			elementItem = event.target;
  			if (elementItem.tagName == 'LI') {
  				self.setSelectedIndex(self.elementItems.indexOf(elementItem), 200);
  			}
  		}, false);
  	};
  
  	Picker.prototype.initInertiaParams = function() {
  		var self = this;
  		self.lastMoveTime = 0;
  		self.lastMoveStart = 0;
  		self.stopInertiaMove = false;
  	};
  
  	Picker.prototype.updateInertiaParams = function(event, isStart) {
  		var self = this;
  		var point = event.changedTouches ? event.changedTouches[0] : event;
  		if (isStart) {
  			self.lastMoveStart = point.pageY;
  			self.lastMoveTime = event.timeStamp || Date.now();
  			self.startAngle = self.list.angle;
  		} else {
  			var nowTime = event.timeStamp || Date.now();
  			if (nowTime - self.lastMoveTime > 300) {
  				self.lastMoveTime = nowTime;
  				self.lastMoveStart = point.pageY;
  			}
  		}
  		self.stopInertiaMove = true;
  	};
  
  	Picker.prototype.startInertiaScroll = function(event) {
  		var self = this;
  		var point = event.changedTouches ? event.changedTouches[0] : event;
  		/** 
  		 * 缓动代码
  		 */
  		var nowTime = event.timeStamp || Date.now();
  		var v = (point.pageY - self.lastMoveStart) / (nowTime - self.lastMoveTime); //最后一段时间手指划动速度  
  		var dir = v > 0 ? -1 : 1; //加速度方向  
  		var deceleration = dir * 0.0006 * -1;
  		var duration = Math.abs(v / deceleration); // 速度消减至0所需时间  
  		var dist = v * duration / 2; //最终移动多少 
  		var startAngle = self.list.angle;
  		var distAngle = self.calcAngle(dist) * dir;
  		//----
  		var srcDistAngle = distAngle;
  		if (startAngle + distAngle < self.beginExceed) {
  			distAngle = self.beginExceed - startAngle;
  			duration = duration * (distAngle / srcDistAngle) * 0.6;
  		}
  		if (startAngle + distAngle > self.endExceed) {
  			distAngle = self.endExceed - startAngle;
  			duration = duration * (distAngle / srcDistAngle) * 0.6;
  		}
  		//----
  		if (distAngle == 0) {
  			self.endScroll();
  			return;
  		}
  		self.scrollDistAngle(nowTime, startAngle, distAngle, duration);
  	};
  
  	Picker.prototype.scrollDistAngle = function(nowTime, startAngle, distAngle, duration) {
  		var self = this;
  		self.stopInertiaMove = false;
  		(function(nowTime, startAngle, distAngle, duration) {
  			var frameInterval = 13;
  			var stepCount = duration / frameInterval;
  			var stepIndex = 0;
  			(function inertiaMove() {
  				if (self.stopInertiaMove) return;
  				var newAngle = self.quartEaseOut(stepIndex, startAngle, distAngle, stepCount);
  				self.setAngle(newAngle);
  				stepIndex++;
  				if (stepIndex > stepCount - 1 || newAngle < self.beginExceed || newAngle > self.endExceed) {
  					self.endScroll();
  					return;
  				}
  				setTimeout(inertiaMove, frameInterval);
  			})();
  		})(nowTime, startAngle, distAngle, duration);
  	};
  
  	Picker.prototype.quartEaseOut = function(t, b, c, d) {
  		return -c * ((t = t / d - 1) * t * t * t - 1) + b;
  	};
  
  	Picker.prototype.endScroll = function() {
  		var self = this;
  		if (self.list.angle < self.beginAngle) {
  			self.list.style.webkitTransition = "150ms ease-out";
  			self.setAngle(self.beginAngle);
  		} else if (self.list.angle > self.endAngle) {
  			self.list.style.webkitTransition = "150ms ease-out";
  			self.setAngle(self.endAngle);
  		} else {
  			var index = parseInt((self.list.angle / self.itemAngle).toFixed(0));
  			self.list.style.webkitTransition = "100ms ease-out";
  			self.setAngle(self.itemAngle * index);
  		}
  		self.triggerChange();
  	};
  
  	Picker.prototype.triggerChange = function(force) {
  		var self = this;
  		setTimeout(function() {
  			var index = self.getSelectedIndex();
  			var item = self.items[index];
  			if ($.trigger && (index != self.lastIndex || force === true)) {
  				$.trigger(self.holder, 'change', {
  					"index": index,
  					"item": item
  				});
  				//console.log('change:' + index);
  			}
  			self.lastIndex = index;
  			typeof force === 'function' && force();
  		}, 0);
  	};
  
  	Picker.prototype.correctAngle = function(angle) {
  		var self = this;
  		if (angle < self.beginAngle) {
  			return self.beginAngle;
  		} else if (angle > self.endAngle) {
  			return self.endAngle;
  		} else {
  			return angle;
  		}
  	};
  
  	Picker.prototype.setItems = function(items) {
  		var self = this;
  		self.items = items || [];
  		var buffer = [];
  		self.items.forEach(function(item) {
  			if (item !== null && item !== undefined) {
  				buffer.push('<li>' + (item.text || item) + '</li>');
  			}
  		});
  		self.list.innerHTML = buffer.join('');
  		self.findElementItems();
  		self.calcElementItemPostion();
  		self.setAngle(self.correctAngle(self.list.angle));
  		self.triggerChange(true);
  	};
  
  	Picker.prototype.getItems = function() {
  		var self = this;
  		return self.items;
  	};
  
  	Picker.prototype.getSelectedIndex = function() {
  		var self = this;
  		return parseInt((self.list.angle / self.itemAngle).toFixed(0));
  	};
  
  	Picker.prototype.setSelectedIndex = function(index, duration, callback) {
  		var self = this;
  		self.list.style.webkitTransition = '';
  		var angle = self.correctAngle(self.itemAngle * index);
  		if (duration && duration > 0) {
  			var distAngle = angle - self.list.angle;
  			self.scrollDistAngle(Date.now(), self.list.angle, distAngle, duration);
  		} else {
  			self.setAngle(angle);
  		}
  		self.triggerChange(callback);
  	};
  
  	Picker.prototype.getSelectedItem = function() {
  		var self = this;
  		return self.items[self.getSelectedIndex()];
  	};
  
  	Picker.prototype.getSelectedValue = function() {
  		var self = this;
  		return (self.items[self.getSelectedIndex()] || {}).value;
  	};
  
  	Picker.prototype.getSelectedText = function() {
  		var self = this;
  		return (self.items[self.getSelectedIndex()] || {}).text;
  	};
  
  	Picker.prototype.setSelectedValue = function(value, duration, callback) {
  		var self = this;
  		for (var index in self.items) {
  			var item = self.items[index];
  			if (item.value == value) {
  				self.setSelectedIndex(index, duration, callback);
  				return;
  			}
  		}
  	};
  
  	if ($.fn) {
  		$.fn.picker = function(options) {
  			//遍历选择的元素
  			this.each(function(i, element) {
  				if (element.picker) return;
  				if (options) {
  					element.picker = new Picker(element, options);
  				} else {
  					var optionsText = element.getAttribute('data-picker-options');
  					var _options = optionsText ? JSON.parse(optionsText) : {};
  					element.picker = new Picker(element, _options);
  				}
  			});
  			return this[0] ? this[0].picker : null;
  		};
  
  		//自动初始化
  		$.ready(function() {
  			$('.mui-picker').picker();
  		});
  	}
  
  })(window.mui || window, window, document, undefined);
  //end