Jq source code parsing is bound to $, the method above jQuery, jqjquery

Jq source code parsing is bound to $, the method above jQuery, jqjquery

1. The method called directly with the $ symbol. How is jQuery encapsulated? Curious?

// The jQuery. extend method is bound to $. JQuery. extend ({// expando is used to determine the uniqueness of the current page. /\ D/non-numeric. The decimal point is removed. Expando: "jQuery" + (version + Math. random ()). replace (/\ D/g, ""), // Assume jQuery is ready without the ready module isReady: true, // error: function (msg) {throw new Error (msg) ;}, // null function noop: function () {}, // determine if it is a function isFunction: function (obj) {return jQuery. type (obj) = "function" ;}, // determines whether the current object is a window object. IsWindow: function (obj) {return obj! = Null & obj = obj. window;}, // determine whether obj is a number. When it is a numeric string, the page can be displayed. For example, "3.2" isNumeric: function (obj) {var type = jQuery. type (obj); return (type = "number" | type = "string ") & /// this means to restrict "3afc strings "! IsNaN (obj-parseFloat (obj);}, // judge whether obj is an object isPlainObject: function (obj) {var proto, Ctor; // obj exists and toString. call (obj )! = "[Object]"; it is definitely not an object. If (! Obj | toString. call (obj )! = "[Object Object]") {return false;} // getProto gets the object on the prototype chain. GetProto = Object. getPrototypeOf (); get the property proto = getProto (obj) on the prototype chain; // getProto (Object. create (null)-> proto = null this is also the Object obj = Object. create (null); if (! Proto) {return true;} // properties on the obj prototype. Proto has the constructor hasOwn = hasOwnPrototypeOf ('name') on it to determine whether an object itself has this attribute. // Ctor: When the proto itself has a constructor, the value of the constructor attribute is obtained. It is actually the obj constructor. Type-> function Ctor = hasOwn. call (proto, "constructor") & proto. constructor; // The Ctor type is "function" and it is the constructor type. In this case, obj is also an object. In my understanding, obj = new O (); is actually the real column return typeof Ctor = "function" & fnToString. call (Ctor) === ObjectFunctionString;}, // judge whether obj is an empty object isEmptyObject: function (obj) {// var o ={} var name; for (name in obj) {return false;} return true;}, // obtain the js data type. In fact, the method is Object. prototype. toString. call (xx); xx is a variable to be detected. The result is "[object]" "[object array]"... type: function (obj) {// remove null and undefined. Return. That is, null or undefined. Because undefined = null-> true. If (obj = null) {return obj + "" ;}// this corresponds to typeof xx (a variable)-> undefined object, number, string, function, boolean (typeof a variable can only get the data type in 6)/*** 1. if obj is an object or obj is a function, then class2type [toString. call (obj)] In class2type, find the corresponding value based on the key value. * Class2type = {* [object]: "object", * [object array]: "array. * Class2type [toString. call (obj)] | "object" is connected for read. If the type value cannot be found in class2type, object ** 2 is directly returned. or return typeof obj.. -> Number, string, and boolean are of the basic data type. (Js contains 5 basic data types. Null, undefined, number, string, boolean) */return typeof obj = "object" | typeof obj = "function "? Class2type [toString. call (obj)] | "object": typeof obj;}, // translates it into a global Eval function. Tell the truth. I didn't understand what this was about. DOMval ();/***** @ param code * function DOMEval (code, doc) {doc = doc | document; var script = doc. createElement ("script"); script. text = code; doc. head. appendChild (script ). parentNode. removeChild (script);} creates a script tag or removes it. I don't know how to use it. */GlobalEval: function (code) {DOMEval (code) ;}, // This is a function used to convert it into a camper. Ms-convert the prefix to the hump. CamelCase: function (string) {return string. replace (rmsPrefix, "ms-"). replace (rdashAlpha, fcamelCase) ;}, // each method. $. Each (obj, function () {}); method used to loop arrays and objects. Each: function (obj, callback) {var length, I = 0; if (isArrayLike (obj) {// execute this method length = obj when obj is an array. length; for (; I <length; I ++) {/* When $. each (obj, function (I, item) {if (I = 2) {return false. }) When the anonymous function in $. each (obj, function () {}) is pure return false;, the loop exists. */If (callback. call (obj [I], I, obj [I]) ===false) {break ;}} else {// for in loop object. Callback. call (obj [I], I, obj, [I]) = false is used together with the array loop for (I in obj) {if (callback. call (obj [I], I, obj [I]) === false) {break ;}} return obj ;}, // remove the white spaces on both sides of text $ ("input "). val (). trim. Text + "" is actually used to convert text into a string. Type. In this case, 123. replace (rtrim, "") will report an error. // If 123 + "" is actually "123" trim: function (text) {return text = null? "": (Text + ""). replace (rtrim, "") ;}, // $. makeArray is actually an array object to convert a class array. /***** @ Param arr * @ param results * @ returns {* | Array} * For example: var B = document. getElementsByTagName ("div"); B. reverse (). If you use B to call the reserver () method, an error is reported. In this case, B is a class array object. * Var a = $. makeArray (document. getElementsByTagName ("div"); a. reverser (). In this way, no error is reported. **/MakeArray: function (arr, results) {var ret = results | []; if (arr! = Null) {if (isArrayLike (Object (arr) {jQuery. merge (ret, typeof arr = "string "? [Arr]: arr);} else {push. call (ret, arr) ;}} return ret ;}, /***** @ param elem the value to be checked * @ param arr The array to be processed * @ param I queries from the nth digit of the array to be processed. the default value is 0 * @ returns {number}.-1 is returned. The value does not exist in arr, or the following table * $. inArray () of the value is displayed (). **/InArray: function (elem, arr, I) {// If arr is null,-1 is returned. /*** For indxOf. call (arr, elem, I); Method Description * var s = new String (); * eg: var indexOf = s. indexOf; Use the indexOf variable to store the indexOf method in the string. * IndexOf. call (arr, elem, I); in fact, it is to inherit the indexOf string to the array and pass the elem and I parameters. * A simpler one can be understood as: arr. indexOf (elem, I); */return arr = null? -1: indexOf. call (arr, elem, I );}, // merge arrays/***** @ param first array * @ param second array * @ returns {*} */merge: function (first, second) {var len = + second. length, // the length of the second array j = 0, // j starts from 0 I = first. length; // the length of the first array for (; j <len; j ++) {first [I ++] = second [j];} // actually, use push. First. length = I; return first;},/***** @ param elems with filter function * @ param callback filter add function * @ param invert to determine $. grep (arr, callback) returns an array that meets or does not meet the conditions. True is a condition. False does not meet the conditions. * @ Returns {Array} ** returns an Array. */Grep: function (elems, callback, invert) {var callbackInverse, matches = [], I = 0, length = elems. length, callbackct =! Invert; // Go through the array, only saving the items // that pass the validator function for (; I <length; I ++) {callbackInverse =! Callback (elems [I], I); if (callbackInverse! = Callbacksponct) {matches. push (elems [I]) ;}return matches ;}, /***** @ param elems array for processing * @ param callback function * @ param arg this parameter is used in the callback function. * Callback (elems [I], I, arg) * @ returns {*} ** $. map (arr, function (item, I, arg) {}, arg) * converts an array into another array through callback. * Eg: var B = [2, 3, 4]; * var a = $. map (B, function (item, I, arg) {* return item + arg; *}, 1) * console. log (a) [3, 4, 5] */map: function (elems, callback, arg) {var length, value, I = 0, ret = []; // Go through the array, translating each of the items to their new values if (isArrayLike (elems) {length = elems. length; for (; I <length; I ++) {value = callback (elems [I], I, arg); if (valu E! = Null) {ret. push (value) ;}// Go through every key on the object,} else {for (I in elems) {value = callback (elems [I], I, arg); if (value! = Null) {ret. push (value) ;}}// Flatten any nested arrays return concat. apply ([], ret) ;}, // a global flag of the object. Did not understand the specific use guid: 1, // Bind a function to a context, optionally partially applying any // arguments. /***** @ param fn * @ param context * @ returns {*} ** es6 also provides new Proxy (). Object. */Proxy: function (fn, context) {var tmp, args, proxy; // if (typeof context = "string") when content is a string ") {tmp = fn [context]; context = fn; fn = tmp;} // Quick check to determine if target is callable, in the spec // this throws a TypeError, but we will just return undefined. if (! JQuery. isFunction (fn) {return undefined;} // Simulated bind args = slice. call (arguments, 2); proxy = function () {return fn. apply (context | this, args. concat (slice. call (arguments) ;}; // Set the guid of unique handler to the same of original handler, so it can be removed proxy. guid = fn. guid = fn. guid | jQuery. guid ++; return proxy;}, // $. now current time rub now: Date. now, // jQuery. support is not used in Core but other projects attach their // properties to it so it needs to exist. /*** check whether the browser supports a certain attribute ** $. support. style */support: support });