nodejs-echarts后台生成图片/转base64

安装模块

npm install node-echarts

图表配置

折线图

var LineChartOption = {
    xAxis: {
        type: 'category',
        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
    },
    yAxis: {
        type: 'value'
    },
    series: [{
        data: [820, 932, 901, 934, 1290, 1330, 1320],
        type: 'line'
    }]
  };

函数调用

生成base64

function draw(){
    var buf= node_echarts({
        width: 500, 
        height: 500, 
        option: HistogramOption,
        //If the path  is not set, return the Buffer of image. 
        //path: path.join(__dirname, '../public/image1.jpg'), 
        enableAutoDispose: true 
      });
      var base64 = `data:image/png;base64,` + buf.toString('base64');
        
      console.log( base64);
}

draw();

生成图片

var path = require('path');
function draw(){
    node_echarts({
        width: 500, 
        height: 500, 
        option: HistogramOption,
        //If the path  is not set, return the Buffer of image. 
        path: path.join(__dirname, '../public/image1.jpg'), 
        enableAutoDispose: true 
      });
}

draw();

图片