fix(性能测试): 报告导出样式问题

frontend/src/business/components/performance/report/PerformanceReportView.vue

@@ -271,12 +271,14 @@ export default {
       let reset = this.exportReportReset;
 
       this.$nextTick(function () {
+        setTimeout(() => {
           html2canvas(document.getElementById('performanceReportExport'), {
             scale: 2
           }).then(function (canvas) {
             exportPdf(name, [canvas]);
             reset();
           });
+        }, 1000);
       });
     },
     exportReportReset() {