getParameterByName, readablizeBytes, formatSize

util.js

function getParameterByName(name, search) {
    var match = RegExp('[?&]' + name + '=([^&]*)')
        .exec(search);
    return match && decodeURIComponent(match[1].replace(/\+/g, ' '));
}

function readablizeBytes(size) {
    if (size <= 100000){
        return '' + size;
    }

    var SizePrefixes = ' KMGTPEZYXWVU';
    if(size <= 0) return '0';
    var t2 = Math.min(Math.round(Math.log(size)/Math.log(1000)), 12);
    return (Math.round(size * 100 / Math.pow(1000, t2)) / 100) +
        SizePrefixes.charAt(t2).replace(' ', '') + '';
}

function formatSize(size1, standard) {
    var size = parseFloat(size1);
    if (standard) {
        standard = standard.toLowerCase();
    }
    if(size<=1){
        return size.toFixed(3);
    }

    var n = 0,
        base = standard == 'si' ? 1000 : 1024,
        prefixes = ' KMGTPEZY';

    if (size >= base) {
        n = Math.floor( Math.log(size) / Math.log(base) );

        if (n >= prefixes.length) {
            return 'N/A';
        }

        size = ( size / Math.pow(base, n) ).toFixed(3) * 1 + '';
    }else{
        size = size.toFixed(3)
    }

    return size + prefixes[n] + ( n && standard == 'iec' ? 'i' : '' ) + '';
}