fix(测试跟踪): 用例审批中导出依赖关系JPG格式，但导出的是PNG格式

--bug=1025873 --user=白奇 【测试跟踪】用例审批中导出依赖关系JPG格式，但导出的是PNG格式 https://www.tapd.cn/55049933/s/1368138

.gitignore

@@ -7,6 +7,7 @@ node/
 # local env files
 .env.local
 .env.*.local
+.history/
 
 # Log files
 npm-debug.log*

framework/sdk-parent/frontend/src/components/chart/MsChart.vue

@@ -87,10 +87,10 @@ export default {
     exportCharts(fileName, type) {
       if (document.getElementsByClassName('ms-chart')) {
         let chartsCanvas = document.getElementsByClassName('ms-chart')[0].querySelectorAll('canvas')[0];
-        let mime = 'image/png';
+        let mime = `image/${type?.toLowerCase() || 'png'}`;
         if (chartsCanvas) {
           // toDataURL()是canvas对象的一种方法，用于将canvas对象转换为base64位编码
-          let imageUrl = chartsCanvas && chartsCanvas.toDataURL("image/png");
+          let imageUrl = chartsCanvas.toDataURL(mime);
           if (navigator.userAgent.indexOf('Trident') > -1) {
             // IE11
             let arr = imageUrl.split(',');

framework/sdk-parent/frontend/src/components/head/DrawerHeader.vue

@@ -19,7 +19,7 @@
               {{ $t('commons.export') }}
             </span>
             <el-dropdown-menu slot="dropdown" class="drawer-header">
-              <el-dropdown-item @click.native.stop="exportJPG">JPG</el-dropdown-item>
+              <el-dropdown-item @click.native.stop="exportJPG">JPEG</el-dropdown-item>
               <el-dropdown-item @click.native.stop="exportPNG">PNG</el-dropdown-item>
             </el-dropdown-menu>
           </el-dropdown>
@@ -44,7 +44,7 @@ export default {
   },
   methods: {
     exportJPG() {
-      this.$emit("export","JPG")
+      this.$emit("export","JPEG")
     },
     exportPNG() {
       this.$emit("export","PNG")