//判断Object类型

functionisObject (obj) {return obj !== null && typeof obj === 'object'}

//判断各种类型

var _toString =Object.prototype.toString;functiontoRawType (value) {return _toString.call(value).slice(8, -1)
}

eg：toRawType(123)"Number"toRawType('assasa')"String"toRawType({a:1})"Object"toRawType([1,2,3])"Array"

序列化：

functiontoString (val) {return val == null? '':typeof val === 'object'? JSON.stringify(val, null, 2): String(val)
}

//群组判断（重要）

functionmakeMap (str,expectsLowerCase
) {var map = Object.create(null);var list = str.split(',');for (var i = 0; i < list.length; i++) {map[list[i]]= true;}returnexpectsLowerCase? function (val) { returnmap[val.toLowerCase()]; }:function (val) { returnmap[val]; }
}

eg1：是否是html标签  svg标签

var isHTMLTag =makeMap('html,body,base,head,link,meta,style,title,' +'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +'s,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +'embed,object,param,source,canvas,script,noscript,del,ins,' +'caption,col,colgroup,table,thead,tbody,td,th,tr,' +'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +'output,progress,select,textarea,' +'details,dialog,menu,menuitem,summary,' +'content,element,shadow,template,blockquote,iframe,tfoot');var isSVG =makeMap('svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +'foreignObject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',true);var isReservedTag = function(tag) {return isHTMLTag(tag) ||isSVG(tag)
};

eg2：这里定义了必须使用属性的判断的函数：  value这个属性的tag有：input,textarea,option,select,progress  这些标签    归属的判断

var acceptValue = makeMap('input,textarea,option,select,progress');var mustUseProp = function(tag, type, attr) {return((attr=== 'value' && acceptValue(tag)) && type !== 'button' ||(attr=== 'selected' && tag === 'option') ||(attr=== 'checked' && tag === 'input') ||(attr=== 'muted' && tag === 'video'))
};

eg3：布尔值的属性的词

var isBooleanAttr =makeMap('allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +'required,reversed,scoped,seamless,selected,sortable,translate,' +'truespeed,typemustmatch,visible');functionsetAttr (el, key, value) {if(isBooleanAttr(key)) {//set attribute for blank value//e.g. <option disabled>Select one</option>if(isFalsyAttrValue(value)) {el.removeAttribute(key);}else{//technically allowfullscreen is a boolean attribute for <iframe>,//but Flash expects a value of "true" when used on <embed> tagvalue = key === 'allowfullscreen' && el.tagName === 'EMBED'? 'true': key;el.setAttribute(key, value);}}else if(isEnumeratedAttr(key)) {el.setAttribute(key, isFalsyAttrValue(value)|| value === 'false' ? 'false' : 'true');}else if(isXlink(key)) {if(isFalsyAttrValue(value)) {el.removeAttributeNS(xlinkNS, getXlinkProp(key));}else{el.setAttributeNS(xlinkNS, key, value);}}else{if(isFalsyAttrValue(value)) {el.removeAttribute(key);}else{el.setAttribute(key, value);}}
}

functiongetPathCharType(ch) {if (ch ===undefined) {return 'eof';}var code = ch.charCodeAt(0);switch(code) {case 0x5B: //[case 0x5D: //]case 0x2E: //.case 0x22: //"case 0x27: //'case 0x30://0returnch;case 0x5F: //_case 0x24://$return 'ident';case 0x20: //Spacecase 0x09: //Tabcase 0x0A: //Newlinecase 0x0D: //Returncase 0xA0: //No-break spacecase 0xFEFF: //Byte Order Markcase 0x2028: //Line Separatorcase 0x2029://Paragraph Separatorreturn 'ws';}//a-z, A-Zif (code >= 0x61 && code <= 0x7A || code >= 0x41 && code <= 0x5A) {return 'ident';}//1-9if (code >= 0x31 && code <= 0x39) {return 'number';}return 'else';
}

var hasOwnProperty =Object.prototype.hasOwnProperty;functionhasOwn (obj, key) {returnhasOwnProperty.call(obj, key)
}hasOwn({aaa:1},'aaa')//true

    functioncached (fn) {var cache = Object.create(null);return (functioncachedFn (str) {var hit =cache[str];return hit || (cache[str] =fn(str))})}/*** Camelize a hyphen-delimited string.*/var camelizeRE = /-(\w)/g;var camelize = cached(function(str) {returnstr.replace(camelizeRE,function (_, c) { return c ? c.toUpperCase() : ''; })});console.log(camelize('as-as'));   //asAs

bind函数

functionbind (fn, ctx) {functionboundFn (a) {var l =arguments.length;returnl? l > 1?fn.apply(ctx, arguments): fn.call(ctx, a): fn.call(ctx)}//record original fn lengthboundFn._length =fn.length;returnboundFn
}

toArray

functiontoArray (list, start) {start= start || 0;var i = list.length -start;var ret = newArray(i);while (i--) {ret[i]= list[i +start];}returnret
}
toArray('qwwqwq')//["q", "w", "w", "q", "w", "q"]

extend 浅拷贝

functionextend (to, _from) {for (var key in_from) {to[key]=_from[key];}returnto
}

extend ({aaa:1},{bbb:1})
//{aaa: 1, bbb: 1}

浏览器判断

var inBrowser = typeof window !== 'undefined';var UA = inBrowser &&window.navigator.userAgent.toLowerCase();var isIE = UA && /msie|trident/.test(UA);var isIE9 = UA && UA.indexOf('msie 9.0') > 0;var isEdge = UA && UA.indexOf('edge/') > 0;var isAndroid = UA && UA.indexOf('android') > 0;var isIOS = UA && /iphone|ipad|ipod|ios/.test(UA);var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;

设置

  _Set = (function() {functionSet () {this.set = Object.create(null);}Set.prototype.has= functionhas (key) {return this.set[key] === true};Set.prototype.add= functionadd (key) {this.set[key] = true;};Set.prototype.clear= functionclear () {this.set = Object.create(null);};returnSet;}());