Edit in JSFiddle

var RealTimeData = function(layers) {
        this.layers = layers;
        this.timestamp = ((new Date()).getTime() / 1000)|0;
    };

    RealTimeData.prototype.rand = function() {
        return parseInt(Math.random() * 100) + 50;
    };

    RealTimeData.prototype.history = function(entries) {
        if (typeof(entries) != 'number' || !entries) {
            entries = 1;
        }

        var history = [];
        for (var k = 0; k < this.layers; k++) {
            history.push({ values: [] });
        }

        for (var i = 0; i < entries; i++) {
            for (var j = 0; j < this.layers; j++) {
                history[j].values.push({time: this.timestamp, y: this.rand()});
            }
            this.timestamp++;
        }

        return history;
    };

    RealTimeData.prototype.next = function() {
        var entry = [];
        for (var i = 0; i < this.layers; i++) {
            entry.push({ time: this.timestamp, y: this.rand() });
        }
        this.timestamp++;
        return entry;
    }

    window.RealTimeData = RealTimeData;


$(function(){

  var data = new RealTimeData(2);

var chart = $('#lineChart')
   .epoch({
        type: 'time.line',
        data: data.history(),
        axes: ['left', 'bottom', 'right']
    });

    window.setInterval(function() { var x= data.next(); chart.push(x); }, 1000);
    chart.push(data.next());
    

});

<div id="lineChart" class="epoch" style="width: 100%; height: 100px;border:solid 1px #C0C0C0;"></div>