var arr1 =['a', 'adb', '345']; var arr2 = [1,4,5,6];
var concatArr = arr1.concat(arr2);    // ["a", "adb", "345", 1, 4, 5, 6]
concatArr.join('-');             //"a-adb-345-1-4-5-6"
var bbb =concatArr.toString();            //"a,adb,345,1,4,5,6"
bbb.split(',');                //["a", "adb", "345", "1", "4", "5", "6"]