//立即执行的函数表达式
(function(){//定义全局变量_$存储window.$var window = this,_$ = window.$,_Amy = window._Amy,DOC = document,W3C = DOC.dispatchEvent,      //判断浏览器html = DOC.documentElement,  //HTML元素head = DOC.head,            //head元素rword = /[^,]+/g,          //匹配除 ","以外的东西class2type = {"[object HTMLDocument]":"Document","[object HTMLCollection]":"NodeList","[object StaticNodeList]":"NodeList","[object DOMWindow]":"Window","[object global]":"Window","null":"Null","NaN":"NaN","undefined":"Undefined"},toString = class2type.toString();"Boolean,Number,String,Function,Array,Da,RegExp,Window,Document,Arguments,NodeList".replace(rword,function(name){class2type["[object " + name+"]"] = name;});Amy = window.Amy = window.$ = function(selector){return new Amy.fn.init(selector);};//选择器初始化querySelectorAmy.fn = Amy.prototype = {init:function(selector){var dom = document.querySelector(selector);return dom;}};Amy.fn.init.prototype = Amy.fn;//对象扩展(原型方法)Amy.extend = Amy.fn.extend = function(obj,prop){if(!prop){prop = obj;obj = this;}for(var attr in prop){obj[attr] = prop[attr];}};Amy.extend({html : html,head :head,/*** 多库并存问题*/noConflict:function(deep){window.$ = _$;if(deep)window.Amy = _Amy;return Amy;},bindThis:function(obj){var me = this;var arg = [].slice.call(arguments,1);return function(){me.apply(obj,arg);}},/*** 运行所有参数，返回运行成功的函数返回值*/these:function(){var returnVal = null;for(var i = 0,len = arguments.length;i<len;i++){var lambda = arguments[i];try{returnVal = lambda();}catch(e){}}return returnVal;},/*** 根据浏览器获取ajax对象*/ajax:function(){return this.these(function() {return new ActiveXObject('Msxml2.XMLHTTP')},function() {return new ActiveXObject('Microsoft.XMLHTTP')},function() {return new XMLHttpRequest()}) || false;},/***数组化 */toArray:function(){return [].slice.call(arguments);},/*** 数组去重*/noRepeat:function(target){var result = {};target.forEach(function(item){result[item] = item;});return Object.keys(result).map(function(item){return item | 0;});},/*** 获取多个Id* @returns {*}*/list:function(){var result = [];for(var i = 0,len =arguments.length;i<len;i++){var element = arguments[i];if(typeof element == "string"){element = $(element);}if(len == 1)return element;elseresult.push(element);}return result;},repeat:(function(){var join = Array.prototype.join,obj = {};return function(target,n){obj.length = n + 1;return join.call(obj,target);};})(),/*** 事件绑定*/bind:W3C?function(el,type,fn,bool){el.addEventListener(type,fn || $.noop,!!bool);return fn;} : function(el,type,fn){el.attachEvent("on"+type,fn || $.noop);return fn;},/*** 解绑事件*/unbind:W3C?function(el,type,fn,bool){el.removeEventListener(type,fn,!!bool);} : function(el,type,fn){el.detachEvent("on"+type,fn);},/*** 用于取得数据的类型（一个参数的情况下）或判定数据的类型（两个参数的情况下）* @param {Any} obj 要检测的东西* @param {String} str ? 要比较的类型* @return {String|Boolean}* @api public*/type:function(obj,str){var result = class2type[(obj != obj || obj == null)?obj:Object.prototype.toString.call(obj)] || obj.nodeName || "#";if(result.charAt(0) === "#"){if(obj == obj.document && obj.document != obj){result = "Window";}else if(obj.nodeType === 9){result = 'Document';}else if(obj.callee){result = "Arguments";}else if(isFinite(obj.length) && obj.item){result = "NodeList";}else{result = Object.prototype.toString.call(obj).slice(8,-1);}}if(str){return str === result;}return result;},noop:function(){},//字符串操作/*** 字符串所占字节数*/btyeLen:function(target){var byteLength = target.length;for(var i = 0,len = target.length;i<len;i++){if(target.charCodeAt(i) > 255)   //若为中文则加1byteLength++;}return byteLength;},/***字符串截取，当超过限定时默认添加三个... */truncate : function(target,length,text){length = length || 30;text = text === void 0?"...":text;return target.length > length?target.slice(0,length - text.length) + text:String(target);},capitalize:function(target){return target.charAt(0).toUpperCase() + target.slice(1).toLowerCase();},/*** 去除字符串开头和结尾空格*/trim : function(str){return str.replace(/^\s+|\s+$/g,"");},//数组操作/*** 判断目标中是否包含一个数（数组或字符串）*/contains : function(target,index){return target.indexOf(index) > -1;},/*** 删除目标（数组）指定位置的一个数(返回bool)*/removeAt:function(target,index){return !!target.splice(index,1).length;},/***删除目标（数组）中第一次出现的数*/remove:function(target,item){var index = target.indexOf(item);if(index > -1){return !!target.splice(index,1);}return false;},/*** 从目标（数组）随机抽取一个数*/random:function(target){return target[(Math.random()*target.length)|0];},/*** 数组平坦化操作* 命名函数表达式，fla只在函数内有定义，这里用递归*/flatten:function fla(target){  var result = [];target.forEach(function(item){if(Array.isArray(item)){result = result.concat(fla(item));}else{result.push(item);}});return result;},/*** 删除数组中null和undefined* 利用filter过滤操作  //返回true值*/compact:function(target){var result = target.filter(function(item){return item != null;});return result;},max:function(target){return Math.max.apply(0, target);},min:function(target){return Math.min.apply(0,target);},//数值扩展/*** 确保数值在[n1,n2]之间*/limit:function(target,n1,n2){var arr = [n1,n2].sort();if(target < arr[0]){target = arr[0];}if(target > arr[1]){target = arr[1];}return target;},iterator:function iter(n,type){if(typeof type == "undefined" || type == "*"){return n==0 ? 1:n*iter(n-1);}else if(type == "+"){return n==0 ? 1:n+iter(n-1);}},/*** 求距离目标最近的数*/near : function(target,n1,n2){var diff1 = Math.abs(target - n1),diff2 = Math.abs(target - n2);return diff1 < diff2?n1:n2;},/*** 复制数组* 一般不希望别人访问原数组进行修改*/clone:function(target){if(this.type(target) == "Array"){var arr = new Array(target.length);for(var i = 0,len = target.length;i<len;i++){arr[i] = target[i];}return arr;}else{return 0;}}});
})();