[轉]仿jQuery封裝Javascript

//前臺調用
var $ = function (args) {
	return new Base(args);
}

//基礎庫
function Base(args) {
	//創建一個數組，來保存獲取的節點和節點數組
	this.elements = [];
	
	if (typeof args == 'string') {
		//css模擬
		if (args.indexOf(' ') != -1) {
			var elements = args.split(' ');			//把節點拆開分別保存到數組裏
			var childElements = [];					//存放臨時節點對象的數組，解決被覆蓋的問題
			var node = [];								//用來存放父節點用的
			for (var i = 0; i < elements.length; i ++) {
				if (node.length == 0) node.push(document);		//如果默認沒有父節點，就把document放入
				switch (elements[i].charAt(0)) {
					case '#' :
						childElements = [];				//清理掉臨時節點，以便父節點失效，子節點有效
						childElements.push(this.getId(elements[i].substring(1)));
						node = childElements;		//保存父節點，因爲childElements要清理，所以需要創建node數組
						break;
					case '.' : 
						childElements = [];
						for (var j = 0; j < node.length; j ++) {
							var temps = this.getClass(elements[i].substring(1), node[j]);
							for (var k = 0; k < temps.length; k ++) {
								childElements.push(temps[k]);
							}
						}
						node = childElements;
						break;
					default : 
						childElements = [];
						for (var j = 0; j < node.length; j ++) {
							var temps = this.getTagName(elements[i], node[j]);
							for (var k = 0; k < temps.length; k ++) {
								childElements.push(temps[k]);
							}
						}
						node = childElements;
				}
			}
			this.elements = childElements;
		} else {
			//find模擬
			switch (args.charAt(0)) {
				case '#' :
					this.elements.push(this.getId(args.substring(1)));
					break;
				case '.' : 
					this.elements = this.getClass(args.substring(1));
					break;
				default : 
					this.elements = this.getTagName(args);
			}
		}
	} else if (typeof args == 'object') {
		if (args != undefined) {    //_this是一個對象，undefined也是一個對象，區別與typeof返回的帶單引號的'undefined'
			this.elements[0] = args;
		}
	} else if (typeof args == 'function') {
		this.ready(args);
	}
}

//addDomLoaded
Base.prototype.ready = function (fn) {
	addDomLoaded(fn);
};

//獲取ID節點
Base.prototype.getId = function (id) {
	return document.getElementById(id)
};

//獲取元素節點數組
Base.prototype.getTagName = function (tag, parentNode) {
	var node = null;
	var temps = [];
	if (parentNode != undefined) {
		node = parentNode;
	} else {
		node = document;
	}
	var tags = node.getElementsByTagName(tag);
	for (var i = 0; i < tags.length; i ++) {
		temps.push(tags[i]);
	}
	return temps;
};

//獲取CLASS節點數組
Base.prototype.getClass = function (className, parentNode) {
	var node = null;
	var temps = [];
	if (parentNode != undefined) {
		node = parentNode;
	} else {
		node = document;
	}
	var all = node.getElementsByTagName('*');
	for (var i = 0; i < all.length; i ++) {
		if (all[i].className == className) {
			temps.push(all[i]);
		}
	}
	return temps;
}

//設置CSS選擇器子節點
Base.prototype.find = function (str) {
	var childElements = [];
	for (var i = 0; i < this.elements.length; i ++) {
		switch (str.charAt(0)) {
			case '#' :
				childElements.push(this.getId(str.substring(1)));
				break;
			case '.' : 
				var temps = this.getClass(str.substring(1), this.elements[i]);
				for (var j = 0; j < temps.length; j ++) {
					childElements.push(temps[j]);
				}
				break;
			default : 
				var temps = this.getTagName(str, this.elements[i]);
				for (var j = 0; j < temps.length; j ++) {
					childElements.push(temps[j]);
				}
		}
	}
	this.elements = childElements;
	return this;
}

//獲取某一個節點，並返回這個節點對象
Base.prototype.ge = function (num) {	
	return this.elements[num];
};

//獲取首個節點，並返回這個節點對象
Base.prototype.first = function () {
	return this.elements[0];
};

//獲取末個節點，並返回這個節點對象
Base.prototype.last = function () {
	return this.elements[this.elements.length - 1];
};

//獲取某一個節點，並且Base對象
Base.prototype.eq = function (num) {
	var element = this.elements[num];
	this.elements = [];
	this.elements[0] = element;
	return this;
};

//獲取當前節點的下一個元素節點
Base.prototype.next = function () {
	for (var i = 0; i < this.elements.length; i ++) {
		this.elements[i] = this.elements[i].nextSibling;
		if (this.elements[i] == null) throw new Error('找不到下一個同級元素節點！');
		if (this.elements[i].nodeType == 3) this.next();
	}
	return this;
};

//獲取當前節點的上一個元素節點
Base.prototype.prev = function () {
	for (var i = 0; i < this.elements.length; i ++) {
		this.elements[i] = this.elements[i].previousSibling;
		if (this.elements[i] == null) throw new Error('找不到上一個同級元素節點！');
		if (this.elements[i].nodeType == 3) this.prev();
	}
	return this;
};

//設置CSS
Base.prototype.css = function (attr, value) {
	for (var i = 0; i < this.elements.length; i ++) {
		if (arguments.length == 1) {
			return getStyle(this.elements[i], attr);
		}
		this.elements[i].style[attr] = value;
	}
	return this;
}

//添加Class
Base.prototype.addClass = function (className) {
	for (var i = 0; i < this.elements.length; i ++) {
		if (!hasClass(this.elements[i], className)) {
			this.elements[i].className += ' ' + className;
		}
	}
	return this;
}

//移除Class
Base.prototype.removeClass = function (className) {
	for (var i = 0; i < this.elements.length; i ++) {
		if (hasClass(this.elements[i], className)) {
			this.elements[i].className = this.elements[i].className.replace(new RegExp('(\\s|^)' +className +'(\\s|$)'), ' ');
		}
	}
	return this;
}

//添加link或style的CSS規則
Base.prototype.addRule = function (num, selectorText, cssText, position) {
	var sheet = document.styleSheets[num];
	insertRule(sheet, selectorText, cssText, position);
	return this;
}

//移除link或style的CSS規則
Base.prototype.removeRule = function (num, index) {
	var sheet = document.styleSheets[num];
	deleteRule(sheet, index);
	return this;
}

//設置innerHTML
Base.prototype.html = function (str) {
	for (var i = 0; i < this.elements.length; i ++) {
		if (arguments.length == 0) {
			return this.elements[i].innerHTML;
		}
		this.elements[i].innerHTML = str;
	}
	return this;
}

//設置鼠標移入移出方法
Base.prototype.hover = function (over, out) {
	for (var i = 0; i < this.elements.length; i ++) {
		addEvent(this.elements[i], 'mouseover', over);
		addEvent(this.elements[i], 'mouseout', out);
	}
	return this;
};

//設置點擊切換方法
Base.prototype.toggle = function () {
	for (var i = 0; i < this.elements.length; i ++) {
		(function (element, args) {
			var count = 0;
			addEvent(element, 'click', function () {
				args[count++ % args.length].call(this);
			});
		})(this.elements[i], arguments);
	}
	return this;
};

//設置顯示
Base.prototype.show = function () {
	for (var i = 0; i < this.elements.length; i ++) {
		this.elements[i].style.display = 'block';
	}
	return this;
};

//設置隱藏
Base.prototype.hide = function () {
	for (var i = 0; i < this.elements.length; i ++) {
		this.elements[i].style.display = 'none';
	}
	return this;
};

//設置物體居中
Base.prototype.center = function (width, height) {
	var top = (getInner().height - 250) / 2;
	var left = (getInner().width - 350) / 2;
	for (var i = 0; i < this.elements.length; i ++) {
		this.elements[i].style.top = top + 'px';
		this.elements[i].style.left = left + 'px';
	}
	return this;
};

//鎖屏功能
Base.prototype.lock = function () {
	for (var i = 0; i < this.elements.length; i ++) {
		this.elements[i].style.width = getInner().width + 'px';
		this.elements[i].style.height = getInner().height + 'px';
		this.elements[i].style.display = 'block';
		document.documentElement.style.overflow = 'hidden';
		addEvent(window, 'scroll', scrollTop);
	}
	return this;
};

Base.prototype.unlock = function () {
	for (var i = 0; i < this.elements.length; i ++) {
		this.elements[i].style.display = 'none';
		document.documentElement.style.overflow = 'auto';
		removeEvent(window, 'scroll', scrollTop);
	}
	return this;
};

//觸發點擊事件
Base.prototype.click = function (fn) {
	for (var i = 0; i < this.elements.length; i ++) {
		this.elements[i].onclick = fn;
	}
	return this;
};

//觸發瀏覽器窗口事件
Base.prototype.resize = function (fn) {
	for (var i = 0; i < this.elements.length; i ++) {
		var element = this.elements[i];
		addEvent(window, 'resize', function () {
			fn();
			if (element.offsetLeft > getInner().width - element.offsetWidth) {
				element.style.left = getInner().width - element.offsetWidth + 'px';
			}
			if (element.offsetTop > getInner().height - element.offsetHeight) {
				element.style.top = getInner().height - element.offsetHeight + 'px';
			}
		});
	}
	return this;
};

//設置動畫
Base.prototype.animate = function (obj) {
	for (var i = 0; i < this.elements.length; i ++) {
		var element = this.elements[i];
		var attr = obj['attr'] == 'x' ? 'left' : obj['attr'] == 'y' ? 'top' : 
					   obj['attr'] == 'w' ? 'width' : obj['attr'] == 'h' ? 'height' : 
					   obj['attr'] == 'o' ? 'opacity' : obj['attr'] != undefined ? obj['attr'] : 'left';

		
		var start = obj['start'] != undefined ? obj['start'] : 
						attr == 'opacity' ? parseFloat(getStyle(element, attr)) * 100 : 
												   parseInt(getStyle(element, attr));
		
		var t = obj['t'] != undefined ? obj['t'] : 10;												//可選，默認10毫秒執行一次
		var step = obj['step'] != undefined ? obj['step'] : 20;								//可選，每次運行10像素
		
		var alter = obj['alter'];
		var target = obj['target'];
		var mul = obj['mul'];
		
		var speed = obj['speed'] != undefined ? obj['speed'] : 6;							//可選，默認緩衝速度爲6
		var type = obj['type'] == 0 ? 'constant' : obj['type'] == 1 ? 'buffer' : 'buffer';		//可選，0表示勻速，1表示緩衝，默認緩衝
		
		
		if (alter != undefined && target == undefined) {
			target = alter + start;
		} else if (alter == undefined && target == undefined && mul == undefined) {
			throw new Error('alter增量或target目標量必須傳一個！');
		}
		
		
		
		if (start > target) step = -step;
		
		if (attr == 'opacity') {
			element.style.opacity = parseInt(start) / 100;
			element.style.filter = 'alpha(opacity=' + parseInt(start) +')';
		} else {
			//element.style[attr] = start + 'px';
		}
		
		
		if (mul == undefined) {
			mul = {};
			mul[attr] = target;
		} 
		

		clearInterval(element.timer);
		element.timer = setInterval(function () {
		
			/*
				問題1：多個動畫執行了多個列隊動畫，我們要求不管多少個動畫只執行一個列隊動畫
				問題2：多個動畫數值差別太大，導致動畫無法執行到目標值，原因是定時器提前清理掉了
				
				解決1：不管多少個動畫，只提供一次列隊動畫的機會
				解決2：多個動畫按最後一個分動畫執行完畢後再清理即可
			*/
			
			//創建一個布爾值，這個值可以瞭解多個動畫是否全部執行完畢
			var flag = true; //表示都執行完畢了
			
			
			for (var i in mul) {
				attr = i == 'x' ? 'left' : i == 'y' ? 'top' : i == 'w' ? 'width' : i == 'h' ? 'height' : i == 'o' ? 'opacity' : i != undefined ? i : 'left';
				target = mul[i];
					

				if (type == 'buffer') {
					step = attr == 'opacity' ? (target - parseFloat(getStyle(element, attr)) * 100) / speed :
														 (target - parseInt(getStyle(element, attr))) / speed;
					step = step > 0 ? Math.ceil(step) : Math.floor(step);
				}
				
				
				
				if (attr == 'opacity') {
					if (step == 0) {
						setOpacity();
					} else if (step > 0 && Math.abs(parseFloat(getStyle(element, attr)) * 100 - target) <= step) {
						setOpacity();
					} else if (step < 0 && (parseFloat(getStyle(element, attr)) * 100 - target) <= Math.abs(step)) {
						setOpacity();
					} else {
						var temp = parseFloat(getStyle(element, attr)) * 100;
						element.style.opacity = parseInt(temp + step) / 100;
						element.style.filter = 'alpha(opacity=' + parseInt(temp + step) + ')';
					}
					
					if (parseInt(target) != parseInt(parseFloat(getStyle(element, attr)) * 100)) flag = false;

				} else {
					if (step == 0) {
						setTarget();
					} else if (step > 0 && Math.abs(parseInt(getStyle(element, attr)) - target) <= step) {
						setTarget();
					} else if (step < 0 && (parseInt(getStyle(element, attr)) - target) <= Math.abs(step)) {
						setTarget();
					} else {
						element.style[attr] = parseInt(getStyle(element, attr)) + step + 'px';
					}
					
					if (parseInt(target) != parseInt(getStyle(element, attr))) flag = false;
				}
				
				//document.getElementById('test').innerHTML += i + '--' + parseInt(target) + '--' + parseInt(getStyle(element, attr)) + '--' + flag + '<br />';
				
			}
			
			if (flag) {
				clearInterval(element.timer);
				if (obj.fn != undefined) obj.fn();
			}
				
		}, t);
		
		function setTarget() {
			element.style[attr] = target + 'px';
		}
		
		function setOpacity() {
			element.style.opacity = parseInt(target) / 100;
			element.style.filter = 'alpha(opacity=' + parseInt(target) + ')';
		}
	}
	return this;
};

//插件入口
Base.prototype.extend = function (name, fn) {
	Base.prototype[name] = fn;
};

 

//瀏覽器檢測
(function () {
	window.sys = {};
	var ua = navigator.userAgent.toLowerCase();	
	var s;		
	(s = ua.match(/msie ([\d.]+)/)) ? sys.ie = s[1] :
	(s = ua.match(/firefox\/([\d.]+)/)) ? sys.firefox = s[1] :
	(s = ua.match(/chrome\/([\d.]+)/)) ? sys.chrome = s[1] : 
	(s = ua.match(/opera\/.*version\/([\d.]+)/)) ? sys.opera = s[1] : 
	(s = ua.match(/version\/([\d.]+).*safari/)) ? sys.safari = s[1] : 0;
	
	if (/webkit/.test(ua)) sys.webkit = ua.match(/webkit\/([\d.]+)/)[1];
})();

//DOM加載
function addDomLoaded(fn) {
	var isReady = false;
	var timer = null;
	function doReady() {
		if (timer) clearInterval(timer);
		if (isReady) return;
		isReady = true;
		fn();
	}
	
	if ((sys.opera && sys.opera < 9) || (sys.firefox && sys.firefox < 3) || (sys.webkit && sys.webkit < 525)) {
		//無論採用哪種，基本上用不着了
		/*timer = setInterval(function () {
			if (/loaded|complete/.test(document.readyState)) { 	//loaded是部分加載，有可能只是DOM加載完畢，complete是完全加載，類似於onload
				doReady();
			}
		}, 1);*/

		timer = setInterval(function () {
			if (document && document.getElementById && document.getElementsByTagName && document.body) {
				doReady();
			}
		}, 1);
	} else if (document.addEventListener) {//W3C
		addEvent(document, 'DOMContentLoaded', function () {
			fn();
			removeEvent(document, 'DOMContentLoaded', arguments.callee);
		});
	} else if (sys.ie && sys.ie < 9){
		var timer = null;
		timer = setInterval(function () {
			try {
				document.documentElement.doScroll('left');
				doReady();
			} catch (e) {};
		}, 1);
	}
}

//跨瀏覽器添加事件綁定
function addEvent(obj, type, fn) {
	if (typeof obj.addEventListener != 'undefined') {
		obj.addEventListener(type, fn, false);
	} else {
		//創建一個存放事件的哈希表(散列表)
		if (!obj.events) obj.events = {};
		//第一次執行時執行
		if (!obj.events[type]) {	
			//創建一個存放事件處理函數的數組
			obj.events[type] = [];
			//把第一次的事件處理函數先儲存到第一個位置上
			if (obj['on' + type]) obj.events[type][0] = fn;
		} else {
			//同一個註冊函數進行屏蔽，不添加到計數器中
			if (addEvent.equal(obj.events[type], fn)) return false;
		}
		//從第二次開始我們用事件計數器來存儲
		obj.events[type][addEvent.ID++] = fn;
		//執行事件處理函數
		obj['on' + type] = addEvent.exec;
	}
}

//爲每個事件分配一個計數器
addEvent.ID = 1;

//執行事件處理函數
addEvent.exec = function (event) {
	var e = event || addEvent.fixEvent(window.event);
	var es = this.events[e.type];
	for (var i in es) {
		es[i].call(this, e);
	}
};

//同一個註冊函數進行屏蔽
addEvent.equal = function (es, fn) {
	for (var i in es) {
		if (es[i] == fn) return true;
	}
	return false;
}

//把IE常用的Event對象配對到W3C中去
addEvent.fixEvent = function (event) {
	event.preventDefault = addEvent.fixEvent.preventDefault;
	event.stopPropagation = addEvent.fixEvent.stopPropagation;
	event.target = event.srcElement;
	return event;
};

//IE阻止默認行爲
addEvent.fixEvent.preventDefault = function () {
	this.returnValue = false;
};

//IE取消冒泡
addEvent.fixEvent.stopPropagation = function () {
	this.cancelBubble = true;
};


//跨瀏覽器刪除事件
function removeEvent(obj, type, fn) {
	if (typeof obj.removeEventListener != 'undefined') {
		obj.removeEventListener(type, fn, false);
	} else {
		if (obj.events) {
			for (var i in obj.events[type]) {
				if (obj.events[type][i] == fn) {
					delete obj.events[type][i];
				}
			}
		}
	}
}


//跨瀏覽器獲取視口大小
function getInner() {
	if (typeof window.innerWidth != 'undefined') {
		return {
			width : window.innerWidth,
			height : window.innerHeight
		}
	} else {
		return {
			width : document.documentElement.clientWidth,
			height : document.documentElement.clientHeight
		}
	}
}

//跨瀏覽器獲取滾動條位置
function getScroll() {
	return {
		top : document.documentElement.scrollTop || document.body.scrollTop,
		left : document.documentElement.scrollLeft || document.body.scrollLeft
	}
}


//跨瀏覽器獲取Style
function getStyle(element, attr) {
	var value;
	if (typeof window.getComputedStyle != 'undefined') {//W3C
		value = window.getComputedStyle(element, null)[attr];
	} else if (typeof element.currentStyle != 'undeinfed') {//IE
		value = element.currentStyle[attr];
	}
	return value;
}


//判斷class是否存在
function hasClass(element, className) {
	return element.className.match(new RegExp('(\\s|^)' +className +'(\\s|$)'));
}


//跨瀏覽器添加link規則
function insertRule(sheet, selectorText, cssText, position) {
	if (typeof sheet.insertRule != 'undefined') {//W3C
		sheet.insertRule(selectorText + '{' + cssText + '}', position);
	} else if (typeof sheet.addRule != 'undefined') {//IE
		sheet.addRule(selectorText, cssText, position);
	}
}

//跨瀏覽器移出link規則
function deleteRule(sheet, index) {
	if (typeof sheet.deleteRule != 'undefined') {//W3C
		sheet.deleteRule(index);
	} else if (typeof sheet.removeRule != 'undefined') {//IE
		sheet.removeRule(index);
	}
}

//刪除左後空格
function trim(str) {
	return str.replace(/(^\s*)|(\s*$)/g, '');
}

//滾動條清零
function scrollTop() {
	document.documentElement.scrollTop = 0;
	document.body.scrollTop = 0;
}

 

$().extend('drag', function () {
	var tags = arguments;
	for (var i = 0; i < this.elements.length; i ++) {
		addEvent(this.elements[i], 'mousedown', function (e) {
			if (trim(this.innerHTML).length == 0) e.preventDefault();
			var _this = this;
			var diffX = e.clientX - _this.offsetLeft;
			var diffY = e.clientY - _this.offsetTop;
			
			//自定義拖拽區域
			var flag = false;
			
			for (var i = 0; i < tags.length; i ++) {
				if (e.target == tags[i]) {
					flag = true;					//只要有一個是true，就立刻返回
					break;
				}
			}
			
			if (flag) {
				addEvent(document, 'mousemove', move);
				addEvent(document, 'mouseup', up);
			} else {
				removeEvent(document, 'mousemove', move);
				removeEvent(document, 'mouseup', up);
			}
			
			function move(e) {
				var left = e.clientX - diffX;
				var top = e.clientY - diffY;
				
				if (left < 0) {
					left = 0;
				} else if (left > getInner().width - _this.offsetWidth) {
					left = getInner().width - _this.offsetWidth;
				}
				
				if (top < 0) {
					top = 0;
				} else if (top > getInner().height - _this.offsetHeight) {
					top = getInner().height - _this.offsetHeight;
				}
				
				_this.style.left = left + 'px';
				_this.style.top = top + 'px';
				
				if (typeof _this.setCapture != 'undefined') {
					_this.setCapture();
				} 
			}
			
			function up() {
				removeEvent(document, 'mousemove', move);
				removeEvent(document, 'mouseup', up);
				if (typeof _this.releaseCapture != 'undefined') {
					_this.releaseCapture();
				}
			}
		});
	}
	return this;
});

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