function envchart(title, tpcol, datalist) {
    var chartDom = document.getElementById('mainchart');
    var myChart = echarts.init(chartDom);
    var option;

    var data = [];
    for(i=0;i<datalist.length;i++){
        data.push([datalist[i]['rectime'], datalist[i][tpcol]]);
    }

    option = {
        tooltip: {
            trigger: 'axis',
            position: function (pt) {
                return [pt[0], '10%'];
            }
        },
        title: {
            left: 'center',
            text: title+'统计表',
        },
        toolbox: {
            feature: {
                dataZoom: {
                    yAxisIndex: 'none'
                },
                restore: {},
                saveAsImage: {}
            }
        },
        xAxis: {
            type: 'time',
            boundaryGap: false
        },
        yAxis: {
            type: 'value',
            boundaryGap: [0, '100%']
        },
        dataZoom: [{
            type: 'inside',
            show:true,
            xAxisIndex:[0],//表示x轴折叠
            start: 0,
            end: 30
        }, {
            type:"inside",
            show:false,
            start: 0,
            end: 50
        }],
        series: [
            {
                name: title,
                type: 'line',
                smooth: false,
                symbol: 'none',
                areaStyle: {},
                data: data
            }
        ]
    };
    option && myChart.setOption(option);
}