js阿拉伯变成中文数字

function NoToChinese(num) {
if (!/^\d*(\.\d*)?$/.test(num)) {
alert('Number is wrong!');
return 'Number is wrong!';
}
var AA = new Array('零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖');
var BB = new Array('', '拾', '佰', '仟', '萬', '亿', '点', '');
var a = ('' + num).replace(/(^0*)/g, '').split('.'),
k = 0,
re = '';
for (var i = a[0].length - 1; i >= 0; i--) {
switch (k) {
case 0:
re = BB[7] + re;
break;
case 4:
if (!new RegExp('0{4}\\d{' + (a[0].length - i - 1) + '}$').test(a[0]))
re = BB[4] + re;
break;
case 8:
re = BB[5] + re;
BB[7] = BB[5];
k = 0;
break;
}
if (k % 4 == 2 && a[0].charAt(i + 2) != 0 && a[0].charAt(i + 1) == 0) re = AA[0] + re;
if (a[0].charAt(i) != 0) re = AA[a[0].charAt(i)] + BB[k % 4] + re;
k++;
}
if (a.length > 1) //加上小数部分(如果有小数部分)
{
re += BB[6];
for (var i = 0; i < a[1].length; i++) re += AA[a[1].charAt(i)];
}
return re;
}

alert(NoToChinese('213123123'));

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