function drawCircle(canvasId, option) {

    const color_arr = option.color

    let data_arr = option.data

    const pi2 = Math.PI * 2;

    let canvas = document.getElementById(canvasId);

    let c = canvas.getContext("2d");

    let startAgl = 0;

    let agl;

    let sum = 0;

    const cW = canvas.width;

    const cH = canvas.height;

    for (let item of data_arr) {

      sum += item.value * 1.0

    }

    data_arr = data_arr.map((v, i) => {

      return {

        name: v.name,

        value: (v.value) * 1.0 / sum

      }

    })

    for (let i = 0; i < data_arr.length; i++) {

      //绘制饼图

      let min = (cW > cH ? cH : cW); //获取canvas宽高的最小值

      agl = data_arr[i].value * pi2 + startAgl; //终点

      c.strokeStyle = color_arr[i];

      c.lineWidth = data_arr[i].value * min * 0.3; // 线的粗细

      c.beginPath();

      c.arc(cW / 2, cH / 2, min * 0.3, startAgl, agl, false); //画圆

      c.stroke();

      c.closePath();

      startAgl = agl;

      //绘制图例

      c.fillStyle = color_arr[i];

      c.fillRect(cW * 0.8, 50 + 18 * i, 16, 16);

      c.fillText(data_arr[i].name, cW * 0.8 + 20, 62 + 18 * i);

    }

  }

let color = ['#0580F2', '#FAA732', '#E1575D', '#8B73CC', '#8CD123', '#4B53BA', '#429588'];

  let option = {

    color: color,

    data: [

      { name: '20', value: '20' },

      { name: '30', value: '30' },

      { name: '40', value: '40' },

      { name: '50', value: '50' },

      { name: '60', value: '60' },

    ]

  }

  drawCircle('myCanvas', option)