Javascriptz格式化数字

Javascriptz格式化数字

< script >
     /* ** 格式化数字显示方式
        * 用法
        * formatNumber(12345.999,'#,##0.00');
        * formatNumber(12345.999,'#,##0.##');
        * formatNumber(123,'000000');
        * @param num* @param pattern
     */
     function  formatNumber(num,pattern){
        num  =  Number(num);
         var  strarr  =  num ? num.toString().split('.'):[' 0 '];
         var  fmtarr  =  pattern ? pattern.split('.'):[''];
         var  retstr = '';     //  整数部分
         var  str  =  strarr[ 0 ];
         var  fmt  =  fmtarr[ 0 ];
         var  i  =  str.length - 1 ;
         var  comma  =   false ;
         for ( var  f = fmt.length - 1 ;f >= 0 ;f -- ){
             switch (fmt.substr(f, 1 )) {
                 case  '#':
                     if (i >= 0  ) retstr  =  str.substr(i -- , 1 )  +  retstr;
                     break ;
                 case  ' 0 ':
                     if (i >= 0 ) retstr  =  str.substr(i -- , 1 )  +  retstr; else  retstr  =  ' 0 '  +  retstr;
                     break ;
                 case  ',':
                    comma  =   true ;
                    retstr = ',' + retstr;
                     break ;
            }
        }
         if (i >= 0 ){
             if (comma){
                 var  l  =  str.length;
                 for (;i >= 0 ;i -- ){
                    retstr  =  str.substr(i, 1 )  +  retstr;
                     if (i > 0   &&  ((l - i) % 3 ) == 0 ) retstr  =  ','  +  retstr;
                }
            }  else  
                retstr  =  str.substr( 0 ,i + 1 )  +  retstr;
        }
            retstr  =  retstr + '.'; //  处理小数部分
            str = strarr.length > 1 ? strarr[ 1 ]:'';
            fmt = fmtarr.length > 1 ? fmtarr[ 1 ]:'';
            i = 0 ;
             for ( var  f = 0 ;f < fmt.length;f ++ ){
                 switch (fmt.substr(f, 1 )){
                     case  '#':
                         if (i < str.length) retstr += str.substr(i ++ , 1 );
                         break ;
                     case  ' 0 ':
                         if (i < str.length) retstr +=  str.substr(i ++ , 1 );
                         else  retstr += ' 0 ';
                         break ;
                    }
            } 
             return  retstr.replace( /^ , +/ ,'').replace( / \.$ / ,'');
    }
    
    document.write( " formatNumber('','')= "   +  formatNumber('',''));
    document.write( " <br/> " );
    document.write( " formatNumber(123456789012.129,null)= "   +  formatNumber( 123456789012.129 , null ));
    document.write( " <br/> " );
    document.write( " formatNumber(null,null)= "   +  formatNumber( null , null ));
    document.write( " <br/> " );
    document.write( " formatNumber(123456789012.129,'#,##0.00')= "   +  formatNumber( 123456789012.129 ,'#,## 0.00 '));
    document.write( " <br/> " );
    document.write( " formatNumber(123456789012.129,'#,##0.##')= "   +  formatNumber( 123456789012.129 ,'#,## 0 .##'));
    document.write( " <br/> " );
    document.write( " formatNumber(123456789012.129,'#0.00')= "   +  formatNumber( 123456789012.129 ,'#,## 0.00 '));
    document.write( " <br/> " );
    document.write( " formatNumber(123456789012.129,'#0.##')= "   +  formatNumber( 123456789012.129 ,'#,## 0 .##'));
    document.write( " <br/> " );
    document.write( " formatNumber(12.129,'0.00')= "   +  formatNumber( 12.129 ,' 0.00 '));
    document.write( " <br/> " );
    document.write( " formatNumber(12.129,'0.##')= "   +  formatNumber( 12.129 ,' 0 .##'));
    document.write( " <br/> " );
    document.write( " formatNumber(12,'00000')= "   +  formatNumber( 12 ,' 00000 '));document.write( " <br/> " );
    document.write( " formatNumber(12,'#.##')= "   +  formatNumber( 12 ,'#.##'));
    document.write( " <br/> " );
    document.write( " formatNumber(12,'#.00')= "   +  formatNumber( 12 ,'#. 00 '));
    document.write( " <br/> " );
    document.write( " formatNumber(1080.0,'#.##')= "   +  formatNumber( 1100.0 ,'#,###.##'));
    document.write( " <br/> " );
</ script >