js 阿拉伯数字转转汉字

var number = 323413290907;
var N = [
"零", "一", "二", "三", "四", "五", "六", "七", "八", "九"
];
function convertToChinese(num){
var str = num.toString();
var len = num.toString().length;
var C_Num = [];
for(var i = 0; i < len; i++){
C_Num.push(N[str.charAt(i)]);
}
return C_Num.join('');
}

var chinese = convertToChinese(number);
alert(chinese);