$(".btn4").click(function(){
    $("#basic-placeholder").show();
    //时间使用刻度                      1387296000000
    var data=[ [1387254600000, 1190], [1387296000000, 1200] ];
    var options={
        series: {
            lines: { show: true },
            points: { show: true }

        },
        xaxis: {
            mode: "time",
            timeformat: "%m-%d",
            min: new Date(2013, 11, 1),
            max: new Date(2013, 11, 31),
            tickSize:  [2, "day"],          
        },
        yaxis:{
            tickDecimals :1,
             tickSize:  5,
            tickFormatter: function (val, axis) {                    
                return val.toFixed(axis.tickDecimals); 
            }
        }
    };

    var plot = $.plot("#basic-placeholder", [data], options);
});

<input type="button" class="btn4" value="加载图表4" />
<div id="basic-placeholder" style="width:800px;height:300px;margin: 10px; display:none;"></div>