JavaScript数组未定义的for循环

我有一个JavaScript数组的一个问题：arrFinal [i]为未定义

I have a problem with a javascript array: "arrFinal[i] is undefined"

在我的剧本arrFinal是动态生成

In my script arrFinal is dynamically generated

function fillTextareas () {
var arrFinal = [];
arrFinal[0] = [];

....
....
// Then some code that define the content of arrFinal, the length of arrFinal ( tailleArrFinal, tailleArrSubFinal)
....
....


for(i=0;i<=tailleArrFinal;i++){
        for(j=0;j<tailleArrSubFinal;j++) {
            $("form textarea#t" + i + "_" + j).val(arrFinal[i][j]);
        }
    }
}

当函数被调用，转储告诉我该阵列arrFinal正确填写和脚本的作品，但我有一个警报arrFinal [i]为未定义。我怎样才能做到这一点不警惕？
谢谢！

When the function is called, a dump show me that the array arrFinal is correctly fill and the script works but i have an alert "arrFinal[i] is undefined". How can i do that without alert ? Thanks !!