使用JavaScript格式化数字的字符串

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例如：1234567??? -- >?? 1,234,567?????????? #,#00

??????????? 1234567??? -- >??? 1,234,567.00???? #,#00.00

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JavaScript函数

function formatNumber(number,pattern){
    var str = number.toString();
    var negative = false;
    if(str.startWith("-")){
    	str = str.substring(1);
    	number = - number;
    	negative = true;
    }
    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 (negative?"-":"")+strInt+(strFloat==''?'':'.'+strFloat);
    // return strInt+(strFloat==''?'':'.'+strFloat);
}

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