// 遍历一个数组或者对象// obj 是需要遍历的数组或者对象// callback 是处理数组/对象的每个元素的回调函数，它的返回值实际会中断循环的过程// args 是额外的参数数组each: function( obj, callback, args ) {var value,i = 0,length = obj.length,isArray = isArraylike( obj );//如果args存在的话，callback中传入的参数是grgs,each循环次数确是由obj来确定的if ( args ) {if ( isArray ) {for ( ; i < length; i++ ) {value = callback.apply( obj[ i ], args );if ( value === false ) {break;}}} else {for ( i in obj ) {value = callback.apply( obj[ i ], args );if ( value === false ) {break;}}}// A special, fast, case for the most common use of each//注意下面用的是call,上面是apply//apply 的第二个参数以数组的形式传入,但是真正运行的时候，//传入的数组参数会变成一个个的形式,而不是一个数组参数} else {if ( isArray ) {for ( ; i < length; i++ ) {value = callback.call( obj[ i ], i, obj[ i ] );if ( value === false ) {break;}}} else {for ( i in obj ) {value = callback.call( obj[ i ], i, obj[ i ] );if ( value === false ) {break;}}}}return obj;},

// 将类数组对象转换为数组对象// 此方法为内部方法makeArray: function( arr, results ) {var ret = results || [];if ( arr != null ) {// 如果 arr 是一个类数组对象，调用 merge 合到返回值if ( isArraylike( Object(arr) ) ) {jQuery.merge( ret,typeof arr === "string" ?[ arr ] : arr);} else {// 如果不是数组，则将其放到返回数组末尾// 等同于 ret.push(arr);
                core_push.call( ret, arr );}}return ret;},

var str="tttt",arr1=[1,2,3],obj={1:0},str2=Object(str);console.log( Object(str))//{0: "t", 1: "t", 2: "t", 3: "t", length: 4, [[PrimitiveValue]]: "tttt"}console.log(str2.length)//4console.log(Object(arr1))//[1, 2, 3]console.log(Object(obj))//{1: 0}

//把second中的属性添加到first中//second可以是数组或者类数组对象，又或者包含0,1属性的东西merge: function( first, second ) {var l = second.length,i = first.length,j = 0;if ( typeof l === "number" ) {for ( ; j < l; j++ ) {first[ i++ ] = second[ j ];}} else {while ( second[j] !== undefined ) {first[ i++ ] = second[ j++ ];}}first.length = i;return first;},

map: function( elems, callback, arg ) {var value,i = 0,length = elems.length,isArray = isArraylike( elems ),ret = [];// Go through the array, translating each of the items to their//如果是数组，isArray=true;//与each传入参数顺序是一致的if ( isArray ) {for ( ; i < length; i++ ) {value = callback( elems[ i ], i, arg );if ( value != null ) {ret[ ret.length ] = value;}}// Go through every key on the object,//如果是对象} else {for ( i in elems ) {value = callback( elems[ i ], i, arg );if ( value != null ) {ret[ ret.length ] = value;}}}// Flatten any nested arraysreturn core_concat.apply( [], ret );},

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 bind//如果传入的参数多余2个，把多余的参数转变为数组。args = core_slice.call( arguments, 2 );proxy = function() {//这里用到了柯里化return fn.apply( context || this, args.concat( core_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;},

function t (l,t,y){var args = [].slice.call( arguments, 2 );console.log(args)function t(){console.log(args.concat([].slice.call( arguments )));}return t;}var tt=t(1,2,3);tt("t");//[3,"t"]