完善

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src/pages/demo/plugins/export/txt.vue

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+<template>
+  <d2-container>
+    <template slot="header">导出文本</template>
+    <el-input
+      type="textarea"
+      :autosize="{minRows: 2, maxRows: 4}"
+      placeholder="请输入内容 然后点击保存按钮导出文本文档"
+      v-model="text">
+    </el-input>
+    <div class="d2-mt">
+      <el-button type="primary" @click="exportTxt">
+        <d2-icon name="download"/>
+        保存为 txt
+      </el-button>
+    </div>
+  </d2-container>
+</template>
+
+<script>
+export default {
+  data () {
+    return {
+      text: ''
+    }
+  },
+  methods: {
+    exportTxt () {
+      // 校验是不是空
+      if (this.text === '') {
+        this.$message('虽然可以为空 但是出于体验不建议这样 还是写点东西吧')
+        return
+      }
+      // 导出
+      this.$export.txt({
+        text: this.text,
+        title: '文本'
+      })
+        .then(() => {
+          this.$message('导出文本成功')
+        })
+    }
+  }
+}
+</script>