封装js千分位加逗号和删除逗号

                //封装js千分位加逗号和删除逗号alert( format(2545678754.020001) )    //2,545,678,754.03alert( format(-2545678754.020001) )    //-2,545,678,754.02alert( format(2545678754.000000000009) );    //当值很长的时候会出现数字被截取的问题alert( delformat('2,545,678,754.03') );    //2545678754.03alert( delformat('-2,545,678,754.03') );    //-2545678754.03function format(num){var sNum=num.toFixed(2)+'',    //将传入的值【四舍五入】保留2位小数re=/(\d+)(\d{3})/;if( /\.\d{3}/.test(num+'') ){if(sNum.charAt(0)!='-'){//如果传入的值不只两位小数，就向前进1保留2位小数，如：1.2400001 -> 1.25sNum=sNum.substring(0,sNum.length-1)+(parseInt(sNum.slice(-1))+1);}}    //向前进1的情况太多，没考虑周全，比如说0.999 -0.0009while(re.test(sNum)){sNum=sNum.replace(re,'$1,$2');}return sNum;}function delformat(sNum){return sNum.replace(/,/g,'');}