fix: 修复自定义JS数据集，多次执行后导致输出字段消失的问题

data-room-ui/example/customDatasetComponents/jsDataSet/index.vue

@@ -152,7 +152,7 @@
           :span="8"
         >
           <div class="right-setting">
-            <div class="paramConfig">
+            <!-- <div class="paramConfig">
               <div class="title-style bs-title-style">
                 方法参数
                 <el-button
@@ -186,7 +186,7 @@
                   </el-button>
                 </div>
               </div>
-            </div>
+            </div> -->
             <div class="structure">
               <div class="title-style bs-title-style">
                 输出字段
@@ -603,7 +603,8 @@ export default {
         const javascript = this.dataForm.config.script
         let scriptMethod = null
         try {
-          scriptMethod = eval(`(${javascript})`)
+          // eslint-disable-next-line no-new-func
+          scriptMethod = new Function(javascript)
         } catch (error) {
           this.passTest = false
           this.$message.error('脚本执行错误，请检查脚本')
@@ -625,12 +626,15 @@ export default {
             }
           })
         })
+        if (this.outputFieldList.length === 0) {
           this.outputFieldList = keys.map(item => {
             return {
               fieldName: item,
               fieldDesc: ''
             }
           })
+        }
+
         if (this.outputFieldList.length && this.fieldDesc) {
           this.buildFieldDesc()
         }