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jQuery原型属性和方法总结

发布时间:2015-07-23 11:00:06
从大四下学期开始了解jquery源码相关的东西,在回校参加毕业典礼(准确的说是参加补考挂科太多)期间便开始借着《jQuery》内幕学习jquery源码,然后在博客园写笔记也已经两个月了,也写了十几篇笔记了但是感觉自己还是懂了jquery的九牛一毛,作为一名初学者而言,希望通过jq ...

jQuery原型属性和方法总结

从大四下学期开始了解jquery源码相关的东西,在回校参加毕业典礼(准确的说是参加补考挂科太多)期间便开始借着《jQuery》内幕学习jquery源码,然后在博客园写笔记也已经两个月了,也写了十几篇笔记了但是感觉自己还是懂了jquery的九牛一毛,作为一名初学者而言,希望通过jquery来增加自己js的能力,但是真正做起来确实难的,本身jquery写的很深奥,再加上平常工作也很忙,中间又辞职找工作找房子住等等就导致学习断断续续的,其实我写的时候很出东西自己也是很困惑的一直希望有人给指点迷津但是似乎大家没太多热情在jqeury源码上面,作为一个前端开发人员要学习的东西太多了可能大家不想把时间浪费在它上面吧。哈哈,有点跑题了,下面开始正题:

jQuery原型属性和方法总结

  jQuery原型属性和方法总结

大致就是这么多还有ready方法是属于dom加载模块的放到后面,现在回过头看看其实东西也不是很多嘛,现在再把这个模块的源码贴出来对比着看一下

jQuery.fn = jQuery.prototype = {  constructor: jQuery,  init: function( selector, context, rootjQuery ) {    var match, elem, ret, doc;    // Handle $(""), $(null), or $(undefined)    if ( !selector ) {      return this;    }    // Handle $(DOMElement)    if ( selector.nodeType ) {      this.context = this[0] = selector;      this.length = 1;      return this;    }    // The body element only exists once, optimize finding it    if ( selector === "body" && !context && document.body ) {      this.context = document;      this[0] = document.body;      this.selector = selector;      this.length = 1;      return this;    }    // Handle HTML strings    if ( typeof selector === "string" ) {      // Are we dealing with HTML string or an ID?      if ( selector.charAt(0) === "<" && selector.charAt( selector.length - 1 ) === ">" && selector.length >= 3 ) {        // Assume that strings that start and end with <> are HTML and skip the regex check        match = [ null, selector, null ];      } else {        match = quickExpr.exec( selector );      }      // Verify a match, and that no context was specified for #id      if ( match && (match[1] || !context) ) {        // HANDLE: $(html) -> $(array)        if ( match[1] ) {          context = context instanceof jQuery ? context[0] : context;          doc = ( context ? context.ownerDocument || context : document );          // If a single string is passed in and it's a single tag          // just do a createElement and skip the rest          ret = rsingleTag.exec( selector );          if ( ret ) {            if ( jQuery.isPlainObject( context ) ) {              selector = [ document.createElement( ret[1] ) ];              jQuery.fn.attr.call( selector, context, true );            } else {              selector = [ doc.createElement( ret[1] ) ];            }          } else {            ret = jQuery.buildFragment( [ match[1] ], [ doc ] );            selector = ( ret.cacheable ? jQuery.clone(ret.fragment) : ret.fragment ).childNodes;          }          return jQuery.merge( this, selector );        // HANDLE: $("#id")        } else {          elem = document.getElementById( match[2] );          // Check parentNode to catch when Blackberry 4.6 returns          // nodes that are no longer in the document #6963          if ( elem && elem.parentNode ) {            // Handle the case where IE and Opera return items            // by name instead of ID            if ( elem.id !== match[2] ) {              return rootjQuery.find( selector );            }            // Otherwise, we inject the element directly into the jQuery object            this.length = 1;            this[0] = elem;          }          this.context = document;          this.selector = selector;          return this;        }      // HANDLE: $(expr, $(...))      } else if ( !context || context.jquery ) {        return ( context || rootjQuery ).find( selector );      // HANDLE: $(expr, context)      // (which is just equivalent to: $(context).find(expr)      } else {        return this.constructor( context ).find( selector );      }    // HANDLE: $(function)    // Shortcut for document ready    } else if ( jQuery.isFunction( selector ) ) {      return rootjQuery.ready( selector );    }    if ( selector.selector !== undefined ) {      this.selector = selector.selector;      this.context = selector.context;    }    return jQuery.makeArray( selector, this );  },  // Start with an empty selector  selector: "",  // The current version of jQuery being used  jquery: "1.7.1",  // The default length of a jQuery object is 0  length: 0,  // The number of elements contained in the matched element set  size: function() {    return this.length;  },  toArray: function() {    return slice.call( this, 0 );  },  // Get the Nth element in the matched element set OR  // Get the whole matched element set as a clean array  get: function( num ) {    return num == null ?      // Return a 'clean' array      this.toArray() :      // Return just the object      ( num < 0 ? this[ this.length + num ] : this[ num ] );  },  // Take an array of elements and push it onto the stack  // (returning the new matched element set)  pushStack: function( elems, name, selector ) {    // Build a new jQuery matched element set    var ret = this.constructor();    if ( jQuery.isArray( elems ) ) {      push.apply( ret, elems );    } else {      jQuery.merge( ret, elems );    }    // Add the old object onto the stack (as a reference)    ret.prevObject = this;    ret.context = this.context;    if ( name === "find" ) {      ret.selector = this.selector + ( this.selector ? " " : "" ) + selector;    } else if ( name ) {      ret.selector = this.selector + "." + name + "(" + selector + ")";    }    // Return the newly-formed element set    return ret;  },  // Execute a callback for every element in the matched set.  // (You can seed the arguments with an array of args, but this is  // only used internally.)  each: function( callback, args ) {    return jQuery.each( this, callback, args );  },  ready: function( fn ) {    // Attach the listeners    jQuery.bindReady();    // Add the callback    readyList.add( fn );    return this;  },  eq: function( i ) {    i = +i;    return i === -1 ?      this.slice( i ) :      this.slice( i, i + 1 );  },  first: function() {    return this.eq( 0 );  },  last: function() {    return this.eq( -1 );  },  slice: function() {    return this.pushStack( slice.apply( this, arguments ),      "slice", slice.call(arguments).join(",") );  },  map: function( callback ) {    return this.pushStack( jQuery.map(this, function( elem, i ) {      return callback.call( elem, i, elem );    }));  },  end: function() {    return this.prevObject || this.constructor(null);  },  // For internal use only.  // Behaves like an Array's method, not like a jQuery method.  push: push,  sort: [].sort,  splice: [].splice};

原标题:jQuery原型属性和方法总结

关键词:jquery

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