javascript 格式化数字 （转）

function formatNumber(number,pattern){
var str = number.toString();
var strInt;
var strFloat;
var formatInt;
var formatFloat;
if(/\./g.test(pattern)){
formatInt = pattern.split('.')[0];
formatFloat = pattern.split('.')[1];
}else{
formatInt = pattern;
formatFloat =null;
}

if(/\./g.test(str)){
if(formatFloat!=null){
var tempFloat = Math.round(parseFloat('0.'+str.split('.')[1])*Math.pow(10,formatFloat.length))/Math.pow(10,formatFloat.length);
strInt = (Math.floor(number)+Math.floor(tempFloat)).toString();
strFloat =/\./g.test(tempFloat.toString())?tempFloat.toString().split('.')[1]:'0';
}else{
strInt = Math.round(number).toString();
strFloat = '0';
}
}else{
strInt = str;
strFloat = '0';
}
if(formatInt!=null){
var outputInt = '';
var zero = formatInt.match(/0*$/)[0].length;
var comma =null;
if(/,/g.test(formatInt)){
comma = formatInt.match(/,[^,]*/)[0].length-1;
}
var newReg =new RegExp('(\\d{'+comma+'})','g');

if(strInt.length<zero){
outputInt =new Array(zero+1).join('0')+strInt;
outputInt = outputInt.substr(outputInt.length-zero,zero)
}else{
outputInt = strInt;
}

var
outputInt = outputInt.substr(0,outputInt.length%comma)+outputInt.substring(outputInt.length%comma).replace(newReg,(comma!=null?',':'')+'$1')
outputInt = outputInt.replace(/^,/,'');

strInt = outputInt;
}

if(formatFloat!=null){
var outputFloat = '';
var zero = formatFloat.match(/^0*/)[0].length;

if(strFloat.length<zero){
outputFloat = strFloat+new Array(zero+1).join('0');
//outputFloat = outputFloat.substring(0,formatFloat.length);
var outputFloat1 = outputFloat.substring(0,zero);
var outputFloat2 = outputFloat.substring(zero,formatFloat.length);
outputFloat = outputFloat1+outputFloat2.replace(/0*$/,'');
}else{
outputFloat = strFloat.substring(0,formatFloat.length);
}

strFloat = outputFloat;
}else{
if(pattern!='' || (pattern=='' && strFloat=='0')){
strFloat = '';
}
}

return strInt+(strFloat==''?'':'.'+strFloat);
}

alert(formatNumber(0,''));
alert(formatNumber(12432.21,'#,###'));
alert(formatNumber(12432.21,'#,###.000#'));
alert(formatNumber(12432,'#,###.00'));
alert(formatNumber('12432.415','#,###.0#'));


</script>