//获取J29单元格值

var a=$('td[id^="J29-"]','div#REPORT0').html();

//计算新值

var b=Number(a.replace(/,/,""))+Number(10);

//字体变色

$('td[id^="J29-"]','div#REPORT0').css('color','red');

//数字转换为千分位的函数

function commafy(num){

  if(/^.*\..*$/.test(num)){

   varpointIndex =num.lastIndexOf(".");

   varintPart = num.substring(0,pointIndex);

   varpointPart =num.substring(pointIndex+1,num.length);

   intPart = intPart +"";

    var re =/(-?\d+)(\d{3})/

    while(re.test(intPart)){

     intPart =intPart.replace(re,"$1,$2")

    }

   num = intPart+"."+pointPart;

  }else{

   num = num +"";

    var re =/(-?\d+)(\d{3})/

    while(re.test(num)){

     num =num.replace(re,"$1,$2")

    }

  }

  return num;

}

//数字转换为千分位

var c=commafy(b);

//改变单元格值

$('td[id^="J29-"]','div#REPORT0').html(c);

点击之后里边的值就显示这样