日常开发记录-elementUI 文件上传假删除，防止删除文件后后悔的操作，无需调用后端删除文件接口+表格数据前端假删除，最后直接把剩余的整个数组对象传给后端接口即可

此篇博客关键是记录这种假删除的思想，后端给的删除接口也不一定非要用。。。

上传文件假删除：

<template>
  <div>
    <el-upload
        class="upload-demo"
        action="https://jsonplaceholder.typicode.com/posts/"
        :on-preview="handlePreview"
        :on-remove="handleRemove"
        :before-remove="beforeRemove"
        multiple
        :limit="3"
        :on-exceed="handleExceed"
        :file-list="fileList">
      <el-button size="small" type="primary">点击上传</el-button>
      <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
    </el-upload>
  </div>
</template>
<script>
export default {
  data () {
    return {
      fileList: [{ name: 'food.jpeg', url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100' }, { name: 'food2.jpeg', url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100' }]
    }
  },
  methods: {
    handleRemove (file, fileList) {
      // 文件即可假删除，无需调用后端接口
      this.fileList = fileList
    },
    handlePreview (file) {
      console.log(file)
    },
    handleExceed (files, fileList) {
      this.$message.warning(`当前限制选择 3 个文件，本次选择了 ${files.length} 个文件，共选择了 ${files.length + fileList.length} 个文件`)
    },
    beforeRemove (file, fileList) {
      return this.$confirm(`确定移除 ${file.name}？`)
    }
  }
}
</script>

表格数据假删除：更适合于数据不是很多的表格，无分页的