构建javascript array包

//像一个数组添加数组。
        copyArray = function(inSrcArray,inDestArray){
            var i;
            for(i=0;i<inSrcArray.length;i++){
                inDestArray.push(inSrcArray[i]);
            }
            return inDestArray;
        }
        var newArray =copyArray([1,5,5,11],[5,8]);
        console.log(newArray); //[5,8,1,5,5,11]

        //在一个数组中查找值。
        findArray = function (inArray,inValue) {
            var i;
            for(i=0;i<inArray.length;i++){
                if (inArray[i]==inValue){
                    return i;
                }
            }
            return -1;
        }
        var right = findArray([9,11,2,4],11);
        console.log(right);//

        //求数组内数字的平均值
        arrayAverage = function (inArray) {
            var accumulator=0;
            var i;
            for(i=0;i<inArray.length;i++){
                accumulator += inArray[i];
            }
            return accumulator/inArray.length;
        }
        var num = arrayAverage([7,9,66,1]);
        console.log(num);