ajax动态赋值echarts饼图

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .html {
            width: 100%;
            height: 100%;
            overflow: hidden;
        }
        .box {
            width: 100%;
            height: 100%;
        }
        #main1 {
            width: 600px;
            height: 500px;
            float: left;
        }
        #main2 {
            width: 50%;
            height: 50%;
            float: left;
        }
    </style>
</head>

<body>
    <div class="box">
        <div id="main1"></div>
        <div id="main2"></div>
    </div>
    <script src="./echarts.min.js"></script>
    <script src="./jquery-3.3.1.js"></script>
    <script>
        var main1 = echarts.init(document.getElementById('main1'));
        var names = [];
        var mydate = [];
        $.ajax({
            method: 'get',
            url: './list.json',
            dataType: 'json',
            success: function (result) {
                for (var i = 0; i < result.date.length; i++) {
                    // console.log(result.date.length)
                    // console.log(result.date[i].name)
                    names.push(result.date[i].name);
                    console.log(names)
                    mydate[i] = { value: result.date[i].num, name: result.date[i].name };
                    console.log(mydate)
                }

                main1.setOption({
                    title: {
                        text: '城市人数分布图',
                        left: 'left'
                    },
                    tooltip: {
                        trigger: 'item',
                        formatter: "{b} : {c} ({d}%)"
                    },
                    legend: {
                        icon: "rect",//形状  类型包括 circle，rect,line，roundRect，triangle，diamond，pin，arrow，none
                        itemWidth: 10,  // 设置宽度
                        itemHeight: 10, // 设置高度
                        itemGap: 10, // 设置间距
                        align: "left",
                        show: true,
                        left: 'right', //位置
                        data: names,
                        textStyle: {
                            //文字样式
                            color: "#9b9fae",
                            fontSize: "12"
                        }
                    },
                    series: [
                        {
                            name: '所占比例',
                            type: 'pie',
                            radius: '55%',
                            center: ['50%', '60%'],
                            data:mydate,
                            emphasis: {
                                itemStyle: {
                                    shadowBlur: 10,
                                    shadowOffsetX: 0,
                                    shadowColor: 'rgba(0, 0, 0, 0.5)'
                                },
                            }
                        }
                    ]
                });
            }
        });
    </script>
</body>
</html>

其中的关键代码是：

mydate[i] = { value: result.date[i].num, name: result.date[i].name };

定义一个数组为names，在 legend中通过 data: names传入图例名称；
创建一个数组mydata[]，用for循环把后台传来的List整个放进去(注意格式为“{value:xxx, name:xxx}”），在option里的series中通过“data: mydata”传入即可；

ajax动态赋值echarts饼图

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .html {
            width: 100%;
            height: 100%;
            overflow: hidden;
        }
        .box {
            width: 100%;
            height: 100%;
        }
        #main1 {
            width: 600px;
            height: 500px;
            float: left;
        }
        #main2 {
            width: 600px;
            height: 500px;
            float: left;
        }
    </style>
</head>

<body>
    <div class="box">
        <div id="main1"></div>
        <div id="main2"></div>
    </div>
    <script src="./echarts.min.js"></script>
    <script src="./jquery-3.3.1.js"></script>
    <script>
        var main2 = echarts.init(document.getElementById('main2'));
        var names = [];
        var nums = [];
        $.ajax({
            method:'get',
            url:'./list.json',
            dataType:'json',
            success:function(res){
                for (var i = 0; i < res.date.length; i++) {
                    names.push(res.date[i].name);
                    nums.push(res.date[i].num);
                   
                }
                console.log(names)
                console.log(nums)
                main2.setOption({
            title: {
                text: '案件处理分析图',
                left: 'left'
            },
            legend: {
                icon: "rect",//形状  类型包括 circle，rect,line，roundRect，triangle，diamond，pin，arrow，none
                itemWidth: 10,  // 设置宽度
                itemHeight: 10, // 设置高度
                itemGap: 10, // 设置间距
                align: "left",
                show: true,
                left: 'right', //位置
                textStyle: {
                    //文字样式
                    color: "#9b9fae",
                    fontSize: "12"
                }
            },
            color: ['#3398DB'],
            tooltip: {
                trigger: 'axis',
                axisPointer: {            // 坐标轴指示器，坐标轴触发有效
                    type: 'shadow'        // 默认为直线，可选为：'line' | 'shadow'
                }
            },
            grid: {
                left: '3%',
                right: '4%',
                bottom: '3%',
                containLabel: true
            },
            xAxis: [
                {
                    type: 'category',
                    data: names,
                    axisTick: {
                        alignWithLabel: true
                    }
                }
            ],
            yAxis: [
                {
                    type: 'value'
                }
            ],
            series: [
                {
                    name: '人数统计',
                    type: 'bar',
                    barWidth: '30%',
                    data: nums
                }
            ]
        });
            }
        })
    </script>
</body>
</html>