1.echarts代码原文http://echarts.baidu.com/examples/editor.html?c=mix-line-bar 在此不进行复制

2.堆叠 stack:'product',

 series: [
        {
            name:'蒸发量',
            type:'bar',
            stack:'堆叠',//堆叠柱状图在此设置成统一名称即可
            data:[2.0, 4.9, 7.0, 23.2, 25.6, 76.7, 135.6, 162.2, 32.6, 20.0, 6.4, 3.3]
        },
        {
            name:'降水量',
            type:'bar',
            stack:'堆叠',//堆叠柱状图在此设置成统一名称即可
            data:[2.6, 5.9, 9.0, 26.4, 28.7, 70.7, 175.6, 182.2, 48.7, 18.8, 6.0, 2.3]
        },
        {
            name:'平均温度',
            type:'line',
            yAxisIndex: 1,
            data:[2.0, 2.2, 3.3, 4.5, 6.3, 10.2, 20.3, 23.4, 23.0, 16.5, 12.0, 6.2]
        }
    ]

2.重叠  barGap: '-100%',

series: [
        {
            name:'蒸发量',
            type:'bar',
            barGap: '-100%',//添加此配置项即为重叠效果
            data:[2.0, 4.9, 7.0, 23.2, 25.6, 76.7, 135.6, 162.2, 32.6, 20.0, 6.4, 3.3]
        },
        {
            name:'降水量',
            type:'bar',
            data:[2.6, 5.9, 9.0, 26.4, 28.7, 70.7, 175.6, 182.2, 48.7, 18.8, 6.0, 2.3]
        },
        {
            name:'平均温度',
            type:'line',
            yAxisIndex: 1,
            data:[2.0, 2.2, 3.3, 4.5, 6.3, 10.2, 20.3, 23.4, 23.0, 16.5, 12.0, 6.2]
        }
    ]