Javascript 如何更新饼图中的数据？

我必须在应用程序中生成饼图。所以我试过这个

var il = document.getElementById("il").value;

var ir = document.getElementById('ir').value;
var iw = document.getElementById('iw').value; <script>
var pie = new d3pie("pieChart",{
        alert('hello');
    "header": {
        "title": {
            "fontSize": 22,
            "font": "verdana"
        },
        "subtitle": {
            "color": "#999999",
            "fontSize": 10,
            "font": "verdana"
        },
        "titleSubtitlePadding": 12
    },
    "footer": {
        "color": "#999999",
        "fontSize": 11,
        "font": "open sans",
        "location": "bottom-center"
    },
    "size": {
        "canvasHeight": 206,
        "canvasWidth": 450,
        "pieInnerRadius": "60%",
        "pieOuterRadius": "70%"
    },
    "data": {
        "content": [
            {
                "label": "Incidents Logs",
                "value": this.il,
                "color": "#38A4DD"
            },
            {
                "label": "Incidents resolved",
                "value":this.ir,
                "color": "#FFC400"
            },
            {
                "label": "incidentsWip",
                "value": this.iw,
                "color": "#B39DDB"
            }
        ]
    },
    "labels": {
        "outer": {
            "format": "none",
            "pieDistance": 32
        },
        "inner": {
            "format": "value"
        },
        "mainLabel": {
            "font": "verdana"
        },
        "percentage": {
            "color": "#e1e1e1",
            "font": "verdana",
            "decimalPlaces": 0
        },
        "value": {
            "color": "#e1e1e1",
            "font": "verdana"
        },
        "lines": {
            "enabled": true,
            "color": "#cccccc"
        },
        "truncation": {
            "enabled": true
        }
    },
    "tooltips": {
        "enabled": true,
        "type": "placeholder",
        "string": "{label}: {value}, {percentage}%",
        "styles": {
            "fontSize": 20
        }
    },  
    "effects": {
        "pullOutSegmentOnClick": {
            "effect": "linear",
            "speed": 400,
            "size": 8
        }
    }
});

</script>

var-il=document.getElementById（“il”）.value；
var ir=document.getElementById（'ir'）。值；
var iw=document.getElementById（'iw'）.value；
var pie=新的d3pie（“pieChart”{
警惕（“你好”）；
“标题”：{
“标题”：{
“字体大小”：22，
“字体”：“verdana”
},
“副标题”：{
“颜色”：“#999999”，
“字体大小”：10，
“字体”：“verdana”
},
“标题子标题添加”：12
},
“页脚”：{
“颜色”：“#999999”，
“字体大小”：11，
“字体”：“打开SAN”，
“位置”：“底部中心”
},
“尺寸”：{
“画布高度”：206，
“画布宽度”：450，
“pieInnerRadius”：“60%”，
“皮奥特拉迪乌斯”：“70%”
},
“数据”：{
“内容”：[
{
“标签”：“事件日志”，
“value”：this.il，
“颜色”：“38A4DD”
},
{
“标签”：“事件已解决”，
“值”：this.ir，
“颜色”：“FFC400”
},
{
“标签”：“意外伤害”，
“值”：this.iw，
“颜色”：“B39DDB”
}
]
},
“标签”：{
“外部”：{
“格式”：“无”，
“距离”：32
},
“内部”：{
“格式”：“值”
},
“主标签”：{
“字体”：“verdana”
},
“百分比”：{
“颜色”：“#e1e1”，
“字体”：“verdana”，
“小数位数”：0
},
“价值”：{
“颜色”：“#e1e1”，
“字体”：“verdana”
},
“行”：{
“启用”：正确，
“颜色”：“#中交”
},
“截断”：{
“已启用”：真
}
},
“工具提示”：{
“启用”：正确，
“类型”：“占位符”，
“字符串”：“{label}:{value}，{percentage}%”，
“风格”：{
“字体大小”：20
}
},  
“影响”：{
“pullOutSegmentOnClick”：{
“效果”：“线性”，
“速度”：400，
“尺寸”：8
}
}
});

但是，我需要在图表中动态更新数据。所以我试着像这样在html中获取隐藏的输入字段

<input id="il" type="hidden" value="<?php echo $data['incidentslogs'];  ?>" /> <input id="ir" type="hidden" value="<?php echo $data['incidentsresolved']; ?>" />          <input id="iw" type="hidden" value="<?php echo $data['incidentswip']; ?>"  />

你认为这说明了怎么做吗