/*** 格式化数字* formatNumber(12345.999,‘#,##0.00‘)* formatNumber(12345.999,‘#,##0.##‘)* formatNumber(123,‘000000‘);* @param num* @param pattern*/function formatNumber(num,pattern){    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+‘.‘;    // 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(/\.$/,‘‘);}