下面常用方法的详细使用请查看:http://www.cnblogs.com/moqiutao/p/4775725.html
1.$.noConflict()方法
语法:jQuery.noConflict(removeAll)
removeAll:布尔值。指示是否允许彻底将 jQuery 变量还原。
源码:
var// Map over jQuery in case of overwrite_jQuery = window.jQuery,// Map over the $ in case of overwrite_$ = window.$;jQuery.noConflict = function( deep ) {if ( window.$ === jQuery ) {window.$ = _$;}if ( deep && window.jQuery === jQuery ) {window.jQuery = _jQuery;}return jQuery; };
2.$.proxy()方法
// A global GUID counter for objectsguid: 1,// Bind a function to a context, optionally partially applying any// arguments.proxy: function( fn, context ) {var tmp, args, proxy;if ( typeof context === "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 bindargs = 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 removedproxy.guid = fn.guid = fn.guid || jQuery.guid++;return proxy;}
3.jQuery.extend = jQuery.fn.extend
// 合并两个或更多对象的属性到第一个对象中,jQuery后续的大部分功能都通过该函数扩展// 通过jQuery.fn.extend扩展的函数,大部分都会调用通过jQuery.extend扩展的同名函数// 如果传入两个或多个对象,所有对象的属性会被添加到第一个对象target// 如果只传入一个对象,则将对象的属性添加到jQuery对象中。// 用这种方式,我们可以为jQuery命名空间增加新的方法。可以用于编写jQuery插件。// 如果不想改变传入的对象,可以传入一个空对象:$.extend({}, object1, object2);// 默认合并操作是不迭代的,即便target的某个属性是对象或属性,也会被完全覆盖而不是合并// 第一个参数是true,则会迭代合并// 从object原型继承的属性会被拷贝// undefined值不会被拷贝// 因为性能原因,JavaScript自带类型的属性不会合并// jQuery.extend( target, [ object1 ], [ objectN ] )// jQuery.extend( [ deep ], target, object1, [ objectN ] ) jQuery.extend = jQuery.fn.extend = function() {var options, name, src, copy, copyIsArray, clone,target = arguments[0] || {},i = 1,length = arguments.length,deep = false;// Handle a deep copy situation// 如果第一个参数是boolean型,可能是深度拷贝if ( typeof target === "boolean" ) {deep = target;target = arguments[1] || {};// skip the boolean and the target// 跳过boolean和target,从第3个开始 i = 2;}// Handle case when target is a string or something (possible in deep copy)// target不是对象也不是函数,则强制设置为空对象if ( typeof target !== "object" && !jQuery.isFunction(target) ) {target = {};}// extend jQuery itself if only one argument is passed// 如果只传入一个参数,则认为是对jQuery扩展if ( length === i ) {target = this;--i;}for ( ; i < length; i++ ) {// Only deal with non-null/undefined values// 只处理非空参数if ( (options = arguments[ i ]) != null ) {// Extend the base objectfor ( name in options ) {src = target[ name ];copy = options[ name ];// Prevent never-ending loop// 避免循环引用if ( target === copy ) {continue;}// Recurse if we're merging plain objects or arrays// 深度拷贝且值是纯对象或数组,则递归if ( deep && copy && ( jQuery.isPlainObject(copy) || (copyIsArray = jQuery.isArray(copy)) ) ) {// 如果copy是数组if ( copyIsArray ) {copyIsArray = false;// clone为src的修正值 clone = src && jQuery.isArray(src) ? src : [];// 如果copy的是对象 } else {// clone为src的修正值 clone = src && jQuery.isPlainObject(src) ? src : {};}// Never move original objects, clone them// 递归调用jQuery.extend target[ name ] = jQuery.extend( deep, clone, copy );// Don't bring in undefined values// 不能拷贝空值 } else if ( copy !== undefined ) {target[ name ] = copy;}}}}// Return the modified object// 返回更改后的对象return target;};