feat: show data labels on channel-compare and spend-share charts

index.html

@@ -5,6 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Moboost 广告投放报告</title>
     <script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.0/dist/chart.umd.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels@2.2.0/dist/chartjs-plugin-datalabels.min.js"></script>
     <style>
         * { margin: 0; padding: 0; box-sizing: border-box; }
         body {
@@ -363,6 +364,8 @@
     }
 
     /* ---------- Tab 1: 投放数据 ---------- */
+    // datalabels 默认全局注册，先取消，只在需要的图表按需启用
+    if (window.ChartDataLabels) { try { Chart.unregister(ChartDataLabels); } catch(e){} }
     const CH_COLORS = { Mintegral:'#3b82f6', MediaGo:'#10b981', Bigo:'#f59e0b' };
     const PALETTE = ['#3b82f6','#10b981','#f59e0b','#ef4444','#8b5cf6','#06b6d4','#ec4899','#84cc16','#f97316','#6366f1'];
     let perfCharts = {};
@@ -471,15 +474,33 @@
                 { label:'转化', data:chConv, backgroundColor:'#ef4444', borderRadius:4, yAxisID:'y1' },
             ]},
             options:{ responsive:true, maintainAspectRatio:false,
-                plugins:{legend:{position:'top',labels:{boxWidth:12,font:{size:11}}}},
+                layout:{padding:{top:24}},
+                plugins:{
+                    legend:{position:'top',labels:{boxWidth:12,font:{size:11}}},
+                    datalabels:{
+                        anchor:'end', align:'end', color:'#374151', font:{size:11,weight:'600'},
+                        formatter:(v,ctx)=> ctx.datasetIndex===0 ? '$'+Math.round(v).toLocaleString() : Math.round(v).toLocaleString()
+                    }
+                },
                 scales:{ x:{grid:{display:false},ticks:{color:'#9ca3af'}},
                     y:{position:'left',ticks:{color:'#9ca3af'},grid:{color:'#f3f4f6'}},
-                    y1:{position:'right',ticks:{color:'#9ca3af'},grid:{display:false}} } }
+                    y1:{position:'right',ticks:{color:'#9ca3af'},grid:{display:false}} } },
+            plugins:[ChartDataLabels]
         });
+        const totalSpend = chSpend.reduce((a,b)=>a+b,0) || 1;
         drawChart('chartSpendShare', {
             type:'doughnut',
             data:{ labels:chans, datasets:[{ data:chSpend, backgroundColor:chans.map(c=>CH_COLORS[c]||'#999') }] },
-            options:{ responsive:true, maintainAspectRatio:false, plugins:{legend:{position:'right',labels:{boxWidth:12,font:{size:11}}}} }
+            options:{ responsive:true, maintainAspectRatio:false,
+                plugins:{
+                    legend:{position:'right',labels:{boxWidth:12,font:{size:11}}},
+                    datalabels:{
+                        color:'#fff', font:{size:12,weight:'700'},
+                        formatter:(v)=> (v/totalSpend*100)>=5 ? '$'+Math.round(v).toLocaleString()+'\n'+(v/totalSpend*100).toFixed(0)+'%' : '',
+                        textAlign:'center'
+                    }
+                } },
+            plugins:[ChartDataLabels]
         });
 
         // ---- 模块4：渠道效率对比（按 产品_国家 分组，展开各渠道）----