option = {
    title: {
        text: '折線圖堆疊'
    },
    tooltip: {
        trigger: 'axis',
        position: function(point, params, dom, rect, size){
        //其中point為當前滑鼠的位置，size中有兩個屬性：viewSize和contentSize，分別為外層div和tooltip提示框的大小
        var x = point[0];//
        var y = point[1];
        
 
var viewWidth = size.viewSize[0];
        var viewHeight = size.viewSize[1];
        var boxWidth = size.contentSize[0];
        var boxHeight = size.contentSize[1];
        var posX = 0;//x座標位置
        var posY = 0;//y座標位置
        
        if(x<boxWidth){//左邊放不開
            posX = 5;    
        }
 
else{//左邊放的下
            posX = x-boxWidth; 
        }
        
        if(y<boxHeight){//上邊放不開
            posY = 5; 
        }else{//上邊放得下
            posY = y-boxHeight;
        }
        
        return [posX,posY];
 
 }
    },
    legend: {
        data:['郵件營銷','聯盟廣告','視訊廣告','直接訪問','搜尋引擎']
    },
    grid: {
        left: 
 
'3%',
        right: '4%',
        bottom: '3%',
        containLabel: true
    },
    toolbox: {
        feature: {
            saveAsImage: {}
        }
    },
    xAxis: {
        type: 'category',
        boundaryGap: false,
        data: ['週一','週二','週三','週四','週五','週六','週日']
    },
    yAxis: {
        type: 'value'
    },
    series: [
        {
            name:'郵件營銷',
            type:'line',
            stack: '總量',
            data:[120, 132, 101, 134, 90, 230, 210]
        },
        {
            name:'聯盟廣告',
            type:'line',
            stack: '總量',
            data:[220, 182, 191, 234, 290, 330, 310]
        },
        {
            name:'視訊廣告',
            type:'line',
            stack: '總量',
            data:[150, 232, 201, 154, 190, 330, 410]
        },
        {
            name:'直接訪問',
            type:'line',
            stack: '總量',
            data:[320, 332, 301, 334, 390, 330, 320]
        },
        {
            name:'搜尋引擎',
            type:'line',
            stack: '總量',
            data:[820, 932, 901, 934, 1290, 1330, 1320]
        }
    ]
};

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