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function addCommas(nStr)
{
    nStr += '';//改变成字符串
    x = nStr.split('.');
    x1 = x[0];
    console.log(x.length)
    x2 = x.length > 1 ? '.' + x[1] : '';
    var rgx = /(\d+)(\d{3})/;
    while (rgx.test(x1)) {
            x1 = x1.replace(rgx, '$1' + ',' + '$2');
    }
    return x1 + x2;
}