Add append and remove functions for Data

Array. prototype. append = function (str ){
Var newArr = new Array (str );
Return this. concat (newArr );
}

Array. prototype. remove = function (str ){
Var retArr = new Array ();
For (I = 0; I <this. length; I ++ ){
If (this [I]! = Str) retArr = retArr. append (this [I]);
}
Return retArr;
}

Array. prototype. hasItem = function (str ){
For (var I = 0; I <this. length; I ++ ){
If (this [I] = str ){
Return true;
}
}
Return false;
}


Tip: javascript has no add, but there are push and unshift methods, there is no remove, but there are pop and shift methods. If not, there are splice methods.