我想在折線圖上設(shè)特定樣式或者某個點圓圈變大，該怎么弄呢

option = {
        tooltip: {
            trigger: 'axis'
        },
        legend: {
            data:['意向','預(yù)購']
        },
        toolbox: {
            show: true,
            feature: {
                magicType: {show: true, type: ['stack', 'tiled']},
                saveAsImage: {show: true}
            }
        },
        xAxis: {
            type: 'category',
            boundaryGap: false,
            data: ['周一','周二','周三','周四','周五','周六','周日']
        },
        yAxis: {
            type: 'value'
        },
        series: [
            {
                name: '預(yù)購',
                type: 'line',
                data: [30, 82, 44, 71, 30, 30, 10]
            },
            {
                name: '意向',
                type: 'line',
                data: [130, 112, 61, 24, 12, 90, 20]
            }]
    };