<!DOCTYPE html>
<html>
<head></head>
<body>
    <div class="row form-inline form-ranking">
    <div class="form-group">
        <label class="control-label">店铺:</label>
        <select class="form-control" tabindex="-1" aria-hidden="true" name="last_day" id="time_slot">
            <option value="7">最近7天</option>
            <option value="15">最近15天</option>
            <option value="30">最近30天</option>
            <option value="self">自定义</option>
        </select>
    </div>
    <div class="form-group" style="display: none;" id="selfDefined">
        <label class="control-label">记录时间:</label>
        <input class="form-control datepicker" name="recordStartLine" type="text">
        <span class="add-on control-label">至</span>
        <input class="form-control datepicker" name="recordEndLine" type="text">
        <button class="btn btn-primary btn-search-line mr10" type="submit">
            <i class="fa fa-search"></i>&nbsp;刷新
        </button>
    </div>
    <div id="linechartmain" style="height: 400px; background: transparent;"> 
    
        //折线堆叠图
    var lineChart = echarts.init(document.getElementById('linechartmain'));
    function buildLineChart(){
        var slot = $('#time_slot').val();
        var start = $("input[name='recordStartLine']").val();
        var end = $("input[name='recordEndLine']").val();
        if(slot == 'self'){
            var diff = DateDiff(end,start);
            if(start == "" || end == ""){
                alert("请选择开始时间和结束时间!");return false;
            }
            if(diff < 0 || diff > 29){
                alert("请选择争取的时间区间.不能超过30天!");return false;
            }
        }

        $.ajax({
                url: 'url',
                type: 'POST',
                data: {slot:slot,_token: g._token,start:start,end:end},
                success: function(res){
                    var result = JSON.parse(res);
                    // console.log(res);
                    option = {
                        title: {
                            text: '折线图堆叠',
                            subtext : '单位:元'
                        },
                        tooltip: {
                            trigger: 'axis'
                        },
                        legend: {
                            data:['京东店', '旗舰店','合计']
                        },
                        grid: {
                            left: '3%',
                            right: '4%',
                            bottom: '3%',
                            containLabel: true
                        },
                        toolbox: {
                            feature: {
                                saveAsImage: {}
                            }
                        },
                        xAxis: {
                            type: 'category',
                            boundaryGap: false,
                            data: result['x']
                        },
                        yAxis: {
                            type: 'value',
                            axisLabel: {
                                formatter: '{value} 元'
                            }
                        },
                        series: [
                            {
                                name:'京东店',
                                type:'line',
                                stack: '总量2',
                                itemStyle : {  
                                    normal : {  
                                        color:'#228B22', 
                                        lineStyle:{  
                                            color:'#228B22'  
                                            }  
                                    }  
                                }, 
                                data:result[2]
                            },
                            {
                                name:'旗舰店',
                                type:'line',
                                stack: '总量4',
                                itemStyle : {  
                                    normal : {  
                                        color:'#DC143C', 
                                        lineStyle:{  
                                            color:'#DC143C'  
                                            }  
                                    }  
                                },
                                data:result[4]
                            },{
                                name:'合计',
                                type:'line',
                                stack: '总量t',
                                data:result['t']
                            },
                        ]
                    };
                    lineChart.setOption(option);
                }
            });
    }

    buildLineChart();
    
</body>
</html>

其中 stack    取不同的值,Y轴的数据就不会叠加在一起;如果是相同的值,则会叠加在一起。

PS:PHP接口返回的数据格式,如$a = [1,2,4,6,7,8],然后直接变成json格式返回即可。