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components/oa/oa-file-upload/index.vue

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+<template>
+  <view>
+    <button type="primary" @click="chooseFile">选择文件</button>
+    <view v-if="fileName" class="file-name">已选择：{{ fileName }}</view>
+  </view>
+</template>
+
+<script>
+export default {
+  name: 'OaFileUpload',
+  props: {
+    // 选择文件后回调，参数为文件临时路径和文件信息
+    onChoose: {
+      type: Function,
+      default: null
+    }
+  },
+  data() {
+    return {
+      fileName: ''
+    }
+  },
+  methods: {
+    chooseFile() {
+      uni.chooseFile({
+        count: 1,
+        success: (res) => {
+          if (res.tempFiles && res.tempFiles.length > 0) {
+            const file = res.tempFiles[0];
+            this.fileName = file.name;
+            this.$emit('choose', file);
+            if (this.onChoose) {
+              this.onChoose(file);
+            }
+          }
+        },
+        fail: (err) => {
+          uni.showToast({ title: '文件选择失败', icon: 'none' });
+        }
+      });
+    }
+  }
+}
+</script>
+
+<style scoped>
+.file-name {
+  margin-top: 16rpx;
+  color: #666;
+  font-size: 28rpx;
+}
+</style>