四舍六入五留双和小数位后补0代码

四舍六入五留双和小数位后补0代码functionformatnumber(value,num){vara,b,c,i;a=value.toString();b=a.indexOf(".");c=a.length;if(num==0){if(b!=-1){a=a.substring(0,b);}}else{if(b==-1){a=a+".";