function format(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(format(123, '#.00 ') )
alert(format(123, '0.## ') )
alert(format(123, '0000.00'))
如果是的话就比较好写,如1楼说的,用IF判断再做处理就OK了啊
<script type="text/javascript">
var format = function (number, form) {
//大概就先这样，代码先不浓缩了。。:D
var forms = form.split('.'), number = '' + number, numbers = number.split('.')
, leftnumber = numbers[0].split('')
, exec = function (lastMatch, $1, $2) {
if ($1 !== '' || $2 !== '') {
if (leftnumber.length) {
return leftnumber.pop();
} else if ($2 !== '') {
return lastMatch;
} else {
return '';
}
} else {
return lastMatch;
}
}, string
string = forms[0].split('').reverse().join('').replace(/(?:(#)|(0)|.)/g, exec).split('').reverse().join('');
string = leftnumber.join('') + string;
if (forms[1] && forms[1].length) {
leftnumber = (numbers[1] && numbers[1].length) ? numbers[1].split('').reverse() : [];
string += '.' + forms[1].replace(/(?:(#)|(0)|.)/g, exec);
}
alert(string.replace(/\.$/, ''));
};
format(123, '#.00') //输出 123.00
format(123, '0.##') //输出 123
format(123, '0000.00 ') //输出 0123.00
format(123456, '###,###.00') //输出 123,456.00
format(07552482630, '(####)########') //输出 (0755)2482630
</script>
LZ注意下.
07数值类型会直接成7
然后你的#里又多写了个
捕获竟然有差别...IE是undefined FF是'' 索性直接改了不捕获了.
<script type="text/javascript">
var format = function (number, form) {
//大概就先这样，代码先不浓缩了。。:D
var forms = form.split('.'), number = '' + number, numbers = number.split('.')
, leftnumber = numbers[0].split('')
, exec = function (lastMatch) {
if (lastMatch == '0' || lastMatch == '#') {
if (leftnumber.length) {
return leftnumber.pop();
} else if (lastMatch == '0') {
return lastMatch;
} else {
return '';
}
} else {
return lastMatch;
}
}, string
string = forms[0].split('').reverse().join('').replace(/./g, exec).split('').reverse().join('');
string = leftnumber.join('') + string;
if (forms[1] && forms[1].length) {
leftnumber = (numbers[1] && numbers[1].length) ? numbers[1].split('').reverse() : [];
string += '.' + forms[1].replace(/./g, exec);
}
return string.replace(/\.$/, '');
};
alert(format(123, '#.00')) //输出 123.00
alert(format(123, '0.##')) //输出 123
alert(format(123, '0000.00 ')) //输出 0123.00
alert(format(123456, '###,###.00')) //输出 123,456.00
alert(format(07552482630, '(####)########')) //输出 (0755)2482630
</script>
等我自己写出来后，将贴上来给大家分享
这种东西是不宜用正则的
用这个：status machine
对于#匹配符号不产生对数字的截取，对于0匹配符才对数字产生截取（当0的数量小于数字数量时），
格式化之后的数字 开头不能为“，”号，结束也不能为“，”。想了一下，用正则不大容易实现，以下是我写的，经过测试无误！
如果用正则能实现，望大家能贴出分享，谢谢 <script language="javascript">
//格式化数字
function format(v, formatString){
var parterns = formatString.split(".");
var numbers = v.split(".");
var lparterns = parterns[0].split("");
var lparternsbak = parterns[0].split("");
var lnumbers = numbers[0].split("");
var lkeep = "";
var rkeep = "";
//得到左侧要替换的部分
var lplaces = [];
for(var i=0;i<lparterns.length;i++){
var parternchar = lparterns[i];
if (parternchar == "#" || parternchar == "0"){
lplaces.push(i);
}
} //替换左侧，左侧有数字才要替换，以避免v = .99型的数字而产生错误
if (lnumbers[0] && lnumbers[0].length>0){
var numberIndex = lnumbers.length - 1;
var replaced = 0;
for(var i=lplaces.length - 1;i>=0;i--){
replaced ++; //被替换的字符数量
var place = lplaces[i];
lparterns[place] = lnumbers[numberIndex];
if (numberIndex == 0) {
break;
}
numberIndex--;
}
//处理以#为第一个格式（#前可能有非0的其他串也在此范围）的格式串，对于以#开头的格式串，将不会截取数字串，要补齐
var lstartIdx = lplaces[0];
if (lparternsbak[lstartIdx]=="#"){
if (lnumbers.length > replaced){
var idx = lnumbers.length - replaced;
for(var i=0;i<idx;i++){
lkeep += lnumbers[i];
}
lparterns[lstartIdx] = lkeep + lparterns[lstartIdx];
}
}
}
//替换右侧
if (parterns[1] && parterns[1].length > 0){
var rparterns = parterns[1].split("");
var rparternsbak = parterns[1].split("");
if (numbers[1] && numbers[1].length>0){
var rnumbers = numbers[1].split(""); //得到右侧将要替换的部分
var rplaces = [];
for(var i=0;i<rparterns.length;i++){
var parternchar = rparterns[i];
if (parternchar == "#" || parternchar == "0"){
rplaces.push(i);
}
}
var replaced = 0;
for(var i=0;i<rplaces.length;i++){
replaced ++; //被替换的字符数量
var place = rplaces[i];
rparterns[place] = rnumbers[i];
if (i==rnumbers.length - 1){
break;
}
}
//处理以#结束的（#后有非0的串也在此范围）
var rlastIdx = rplaces[rplaces.length-1];
if (rparternsbak[rlastIdx]=="#"){
for(var i=replaced-1;i<rnumbers.length;i++){
rkeep += rnumbers[i];
}
rparterns[rlastIdx] += rkeep;
}
}
}
for(var i=0;i<lparterns.length;i++){
if (lparterns[i]=="#"){
lparterns[i] = "";
}
}
var result = lparterns.join("");
if (parterns[1]){
for(var i=0;i<rparterns.length;i++){
if (rparterns[i] == "#"){
rparterns[i] = "";
}
}
result += "." + rparterns.join("");
}
//第一位不能为,号
if (result.substring(0,1)==","){
result = result.substring(1);
}
//最后一位也不能为,号
if (result.substring(result.length-1)==","){
result = result.substring(0,result.length);
}
return result;
} alert(format("12345.67","#,###.00")); //输出：12,345.67
alert(format("12345.67","0,000.00")); //输出：2,345.67（0匹配符，产生了截取）
alert(format("12345.67","#.00")); //输出：12345.00
alert(format("12345.67","￥#,###元0角0分")); //输出：￥12,345元6角7分
alert(format(".67","#,###.00")); //输出：.67
alert(format(".67","###,##0.00")); //输出：0.67
alert(format("12345.67","FUCK CNN#想怎样输出就怎样,##输出#FUCK JAPANESE.0祖国万岁"));
//输出：FUCK CNN12想怎样输出就怎样,34输出5FUCK JAPANESE.6祖国万岁 (:D，一般没这么离谱，在前后加特殊字符比较常用)
alert(format("12345.67","钱不少啊￥###,##0.00元")); //输出：钱不少啊￥12,345.67元
alert(format("075524826309","(#)########")); //输出：(0755)24826309
alert(format("075524826309","(000)########")); //输出：(755)24826309 （取三位区号） </script>
编程动力 http://www.bcexe.com 专业的编程开发类网站,网络编程,软件开发,网站开发,一切尽在这里!
String.prototype.format = function(f) {
this.fStr = function (n,f,p){
var fc=s=r="",pos;
if(!p){
n=n.split("").reverse().join("")
f=f.split("").reverse().join("")
}
for (var i=j=0; i<f.length; i++,j++) {
s = n.charAt(j)
fc = f.charAt(i)
switch (fc) {
case "#" :
r += s;pos=i;break;
case "0" :
r = s||s==fc?(r+s):(p?0+r:r+0);pos=i;break;
case "." :
r += s==fc?s:(j--,fc);break;
case "," :
r += s==fc?s:(j--,fc);break;
default :
r += fc;
j--;
}
}
if(j!=n.length&&f.charAt(f.length-1)!="0"&&pos!=f.length&&f.charAt(pos)!="0")r = r.substr(0,pos+1)+n.substr(j)+r.substr(pos+1)
return (p?r:r.split("").reverse().join("")).replace(/(^,)|(,$)|(,,+)/g,"");
}
var n = this.toString();
if(n.length==0)return "";
if (f == undefined)return this;
f = f.split("."),n = n.split(".");
return f.length>1?this.fStr(n[0],f[0])+"."+this.fStr(n[1],f[1],1):this.fStr(n[0],f[0]);
}
n = "12442.0911";
document.write(n.format("a#a0#.0##a"))
</script>
用截取字符串的方法写了一个,测一下看是否还有特例没包含进去的。
String.prototype.format = function(f) {
this.fStr = function (n,f,p){
var fc=s=r="",pos;
if(!p){
n=n.split("").reverse().join("")
f=f.split("").reverse().join("")
}
for (var i=j=0; i<f.length; i++,j++) {
s = n.charAt(j)
fc = f.charAt(i)
switch (fc) {
case "#" :
r += s;pos=i;break;
case "0" :
r = s||s==fc?(r+s):r+0;pos=i;break;//原方法,这里对小数点后的处理有点问题.
case "." :
r += s==fc?s:(j--,fc);break;
case "," :
r += s==fc?s:(j--,fc);break;
default :
r += fc;
j--;
}
}
if(j!=n.length&&f.charAt(f.length-1)!="0"&&pos!=f.length&&f.charAt(pos)!="0")r = r.substr(0,pos+1)+n.substr(j)+r.substr(pos+1)
return (p?r:r.split("").reverse().join("")).replace(/(^,)|(,$)|(,,+)/g,"");
}
var n = this.toString();
if(n.length==0)return "";
if (f == undefined)return this;
f = f.split("."),n = n.split(".");
return f.length>1?this.fStr(n[0],f[0])+"."+this.fStr(n[1],f[1],1):this.fStr(n[0],f[0]);
}
n = ".0911";
document.write(n.format("a00#a0#00.0#0000a"))
</script>
上面的有个错误，改了一下.
var n = num_in.toString();
if(n.length==0)return "";
if (f == undefined)return num_in;
f = f.split("."),n = n.split(".");
return f.length>1?fStr(n[0],f[0])+"."+ (n.length<=1?fStr("0",f[1],1):fStr(n[1],f[1],1)):fStr(n[0],f[0]);//就改了这一行
function fStr(n,f,p){
var fc=s=r="",pos;
if(!p){
n=n.split("").reverse().join("")
f=f.split("").reverse().join("")
}
for (var i=j=0; i<f.length; i++,j++) {
s = n.charAt(j)
fc = f.charAt(i)
switch (fc) {
case "#" :
r += s;pos=i;break;
case "0" :
r = s||s==fc?(r+s):r+0;pos=i;break;
case "." :
r += s==fc?s:(j--,fc);break;
case "," :
r += s==fc?s:(j--,fc);break;
default :
r += fc;
j--;
}
}
if(j!=n.length&&f.charAt(f.length-1)!="0"&&pos!=f.length&&f.charAt(pos)!="0")r = r.substr(0,pos+1)+n.substr(j)+r.substr(pos+1)
return (p?r:r.split("").reverse().join("")).replace(/(^,)|(,$)|(,,+)/g,"");
}
};
function format(val, formatString){
var re=/%/;
if(re.test(formatString))
{
val=val*100;
}
var patterns = formatString.split(".");
var numbers = (val+"").split(".");
var lpatterns = patterns[0].split("");
var lpatternsbak = patterns[0].split("");
var lkeep = "";
var rkeep = "";
//小数点后大于样式长度进行四舍五入
if (numbers[1]){
var rnumbers=numbers[1].split("");
var count=0;
if(patterns[1]){
var rpatterns = patterns[1].split("");
for(var i=0;i< rpatterns.length;i++){
if(rpatterns[i]=="#"|| rpatterns[i]=="0"){
count++;
}
}
}
if(rnumbers.length>count){
numbers = ( val.toFixed(count)+"").split(".");
}
}
var lnumbers = numbers[0].split("");
//得到左侧要替换的部分
var lplaces = [];
for(var i=0;i <lpatterns.length;i++){
var parternchar = lpatterns[i];
if (parternchar == "#" || parternchar == "0"){
lplaces.push(i);
}
}
//替换左侧，左侧有数字才要替换，以避免v = .99型的数字而产生错误
if (lnumbers[0] && lnumbers[0].length>0){
var numberIndex = lnumbers.length - 1;
var replaced = 0;
for(var i=lplaces.length - 1;i>=0;i--){
replaced ++; //被替换的字符数量
var place = lplaces[i];
lpatterns[place] = lnumbers[numberIndex];
if (numberIndex == 0) {
break;
}
numberIndex--;
}
//处理以#为第一个格式（#前可能有非0的其他串也在此范围）的格式串，对于以#开头的格式串，将不会截取数字串，要补齐
var lstartIdx = lplaces[0];
//补漏
var nlen=lnumbers.length;
var plen=lplaces.length;
if(nlen>plen)
lpatternsbak.splice(lstartIdx,0,"#");
if (lpatternsbak[lstartIdx]=="#"){
if (lnumbers.length > replaced){
var idx = lnumbers.length - replaced;
for(var i=0;i <idx;i++){
lkeep += lnumbers[i];
}
lpatterns[lstartIdx] = lkeep + lpatterns[lstartIdx];
}
}
}
//替换右侧
if (patterns[1] && patterns[1].length > 0){
var rpatterns = patterns[1].split("");
if (numbers[1] && numbers[1].length>0){
var rnumbers = numbers[1].split(""); //得到右侧将要替换的部分
var rplaces = [];
for(var i=0;i <rpatterns.length;i++){
var parternchar = rpatterns[i];
if (parternchar == "#" || parternchar == "0"){
rplaces.push(i);
}
}
var replaced = 0;
for(var i=0;i <rplaces.length;i++){
replaced ++; //被替换的字符数量
var place = rplaces[i];
rpatterns[place] = rnumbers[i];
if (i==rnumbers.length - 1){
break;
}
}
}
}
for(var i=0;i <lpatterns.length;i++){
if (lpatterns[i]=="#"){
lpatterns[i] = "";
}
}
var result = lpatterns.join("");
if (patterns[1]){
for(var i=0;i <rpatterns.length;i++){
if (rpatterns[i] == "#"){
rpatterns[i] = "";
}
}
result += "." + rpatterns.join("");
}
//第一位不能为,号
if (result.substring(0,1)==","){
result = result.substring(1);
}
//最后一位也不能为,号
if (result.substring(result.length-1)==","){
result = result.substring(0,result.length);
}
return result;
} format(0.784,"0.0%")=78.4%;
format(321.49,"0.0")=321.5;(vb的format是这样的,整数不应该截走，小数却可以)