echarts 正负条形图将都设置成正数_echarts中y轴上面设置为复制,下面为正值-优快云博客

本文介绍如何在Echarts中将正负条形图统一显示为正值，通过JavaScript处理数据并展示在HTML页面上，提供了一种实现效果的截图，并详细解释了实现过程。

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html + js

<!--
    THIS EXAMPLE WAS DOWNLOADED FROM https://echarts.apache.org/examples/zh/editor.html?c=bar-background
-->
<!DOCTYPE html>
<html style="height: 100%">
    <head>
        <meta charset="utf-8">
    </head>
    <body style="height: 100%; margin: 0">
        <div id="container" style="height: 100%"></div>

        
        <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/echarts@5.3.2/dist/echarts.min.js"></script>
        <!-- Uncomment this line if you want to dataTool extension
        <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/echarts@5.3.2/dist/extension/dataTool.min.js"></script>
        -->
        <!-- Uncomment this line if you want to use gl extension
        <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/echarts-gl@2/dist/echarts-gl.min.js"></script>
        -->
        <!-- Uncomment this line if you want to echarts-stat extension
        <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/echarts-stat@latest/dist/ecStat.min.js"></script>
        -->
        <!-- Uncomment this line if you want to use map
        <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/echarts@5.3.2/map/js/china.js"></script>
        <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/echarts@5.3.2/map/js/world.js"></script>
        -->
        <!-- Uncomment these two lines if you want to use bmap extension
        <script type="text/javascript" src="https://api.map.baidu.com/api?v=2.0&ak=<Your Key Here>"></script>
        <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/echarts@{{version}}/dist/extension/bmap.min.js"></script>
        -->

        <script type="text/javascript">
var dom = document.getElementById("container");
var myChart = echarts.init(dom);
var app = {};

var option;



const labelTop = {
  position: 'top'
};
const labelBottom = {
  position: 'bottom'
};
option = {
  tooltip: {
    trigger: 'item',
    axisPointer: {
      type: 'shadow'
    },
    // 负数显示正值
    formatter: (params) => {
      let val = params.value
      if (val < 0) return ''+-val;
      else return '' + val;
    }
  },
  xAxis: {
    type: 'category',
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
    
    axisLabel: { show: false },
    axisTick: { show: false },
    
  },
  yAxis: {
    type: 'value',
    axisLine: { show: true },
    splitLine: { show: false },
    axisLabel: {
      formatter: (value) => {
        // 负数取反 显示的就是正数了
        if (value < 0) return -value;
        else return value;
      }
    }
  },
  series: [
    {
      data: [
        { value: -50, label: labelTop },
        { value: -68, label: labelTop },
        { value: -98, label: labelTop },
        { value: 68, label: labelBottom },
        { value: -98, label: labelTop },
        { value: 98, label: labelBottom }
      ],
      type: 'bar',
      label: {
        show: true,
        formatter: '{b}'
      }
    }
  ]
};


if (option && typeof option === 'object') {
    myChart.setOption(option);
}

        </script>
    </body>
</html>