function convertToChinese(num) {
    num=''+num;
    var ret='', ret2='', zero='';
    var nWord=['零','一','二','三','四','五','六','七','八','九','十'];
    var unitWord=['','十','百','千'], unitWord2=['','萬','億','兆'];
    var rWord=[[/^一十/, '十']];
    var n=num.replace(/\D/g,'').split('');
    for(var i=0;i<n.length;i++) {
     if(Math.floor((n.length-i-1)/4)>=unitWord2.length) {
      ret2+= nWord[n[i]];
      continue;
     }
     if(n[i]==0)
      zero=nWord[0];
     else {
      ret+= (ret==''&&ret2==''?'':zero) + nWord[n[i]] + unitWord[(n.length-i-1)%4];
      zero='';
     }
     if((n.length-i-1)%4==0) {
      if(ret!='') ret2+= ret+unitWord2[Math.floor((n.length-i-1)/4)];
      zero='';
      ret='';
     }
    }
    for(var i=0;i<rWord.length;i++)
     ret2=ret2.replace(rWord[i][0], rWord[i][1]);
    return ret2;
   }