阿拉伯数字转中文大写数字的JS

 function intToChinese ( str ) {
     str = str+'';
     var len = str.length-1;
     var idxs = ['','十','百','千','万','十','百','千','亿','十','百','千','万','十','百','千','亿'];
     var num = ['零','壹','贰','叁','肆','伍','陆','柒','捌','玖'];
     return str.replace(/([1-9]|0+)/g,function( $, $1, idx, full) {
         var pos = 0;
         if( $1[0] != '0' ){
             pos = len-idx;
             if( idx == 0 && $1[0] == 1 && idxs[len-idx] == '十'){
                 return idxs[len-idx];
             }
             return num[$1[0]] + idxs[len-idx];
         } else {
             var left = len - idx;
             var right = len - idx + $1.length;
             if( Math.floor(right/4) - Math.floor(left/4) > 0 ){
                 pos = left - left%4;
             }
             if( pos ){
                 return idxs[pos] + num[$1[0]];
             } else if( idx + $1.length >= len ){
                 return '';
             }else {
                 return num[$1[0]]
             }
         }
     });
 }