Homemade jquery (3)

1(function(window, undefined) {2     varJQuery = (function(){3         varJQuery =function(selector) {4             return NewJQuery.fn.init (selector);5         };6 7         //here fn is the alias of prototype, and the later code extension FN is the extension PROTOTYPE,FN writes it short.8         //If a large number of Prototype,prototype are referenced later because they are keywords, they cannot be compressed .9Jquery.fn = Jquery.prototype = {Ten Constructor:jquery, One             //This is a constructor function AInit:function(Selector, context) { -                 varRoot; -                 //If you don't have root, start looking for it from document theRoot = Context | |document; -                 // -                 varParts = Selector.split (""),//separating selectors with spaces -query = Parts[0],//Take out the first paragraph of the result +                     //Slice returns a new array consisting of the 1th item to the last item -                     //join converts each element in the array to a string and joins it with a space to form a string object . +Rest = Parts.slice (1). Join (""), AElems = root.getelementsbytagname (query),//find elements that match the first segment selector atresults = [];//Initializes an array to hold the query results -  -                      for(vari = 0; i < elems.length; i++){ -                         if(rest) { -                             //recursive lookup, with Elems[i] as the context, with rest as the selector expression -                             //Concat creates a copy of the original array and adds the result of the find to the end of results, where the reference to the copy is stored back into the results inResults =Results.concat (Find (rest, elems[i])); -                         } to                         Else{ +                             //Save the found element on the results array - Results.push (Elems[i]); the                         } *                     } $                 //true jquery returns is not an array object, it is an object of class arraysPanax Notoginseng                 returnResults//returns the Array object -  the             } +         }; AJQuery.fn.init.prototype =Jquery.fn; theJquery.extend = JQuery.fn.extend =function(){ +             varOB = Arguments[0]; -              for(varPinchob) { $                 if(Ob.hasownproperty (P) && (! This. hasOwnProperty (p))) { $                      This[p]=Ob[p]; -                 } -             } the         }; - Wuyi         //used to extend the global object, so do not jQuery.fn.extend the Jquery.extend ({ -Isfunction:function () { Wu                 if(typeofArguments[0] = = "function") -                     return true; About                 Else $                     return false; -             } -         }); -  A Jquery.extend ({ +Isfrom:function(){ the             returnArgument[0].constructor = = Arguments[1]; -             //return arguments[0] instanceof arguments[1]; $         }}); the  the  the Jquery.extend ({ theeachfunction(obj,callback) { -                  for(vari = 0; i < obj.length; i++){ inCallback.call (obj | |NULL, Obj[i], I, obj); the                 } the             } About         }); the /* the for an HTML document, getElementsByTagName returns a Htmlcollection object that is similar to the NodeList object, which is implemented in C + + the See "JS elevation" P257 + return Jquery.makearray (document.getElementsByTagName (selector)); - */ the Jquery.extend ({BayiMakearray:function(array, results) { the                 //the array is htmlcollection to the image theArray = Array.prototype.slice.call (array, 0 ); -                 if(results) { - results.push.apply (results, array); the                     returnresults; the                 } the  the                 returnArray; -             } the         }); the         returnJQuery; the     })();94Window.jquery = window.$ =JQuery; the}) (window);

Currently only tag selectors are supported, such as "div", "div p". and $ ("div") returns an array object, different from the actual jquery

Homemade jquery (3)