jQuery中的函数汇总1

// 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 ) {
             ( isArray ) {
                for ( ; i < length; i++ ) {
                    value = callback.apply( obj[ i ],args );

                    if ( value === false ) {
                        break;
                    }
                }
            } else {
                for ( i in obj ) {
                    value =;
                    }
                }
            }

         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
        }  {
             callback.call( obj[ i ],i,obj[ i ] );

                    ;
                    }
                }
            }
        }

        return obj;
    },

 将类数组对象转换为数组对象
     此方法为内部方法
    makeArray: ( 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
             ( isArraylike( Object(arr) ) ) {
                jQuery.merge( ret,typeof arr === "string" ?
                    [ arr ] : arr
                );
            }  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 );
            }
        }

         ret;
    },

var str="tttt"],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)4
    console.log(Object(arr1))[1,3]
    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: ( first,second ) {
        var l = second.length,i = first.length,j = 0;

        if ( typeof l === "number"for ( ; j < l; j++ ) {
                first[ i++ ] = second[ j ];
            }
        } while ( second[j] !== undefined ) {
                first[ i++ ] = second[ j++ ];
            }
        }

        first.length = i;

         first;
    },

map: ( elems,arg ) {
         elems.length,1)"> 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
         ( isArray ) {
             ) {
                value = callback( elems[ i ],arg );

                if ( value !=  ) {
                    ret[ ret.length ] = value;
                }
            }

         Go through every key on the object,
        如果是对象
        }  elems ) {
                value = value;
                }
            }
        }

         Flatten any nested arrays
         core_concat.apply( [],ret );
    },

proxy: ( fn,context ) {
         tmp,args,proxy;

        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 ) ) {
             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 = () {
            这里用到了柯里化
            return fn.apply( context || this 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++ proxy;
    },

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