element upload 图片上传

<template>
  <div>
    <el-upload
      class="avatar-uploader"
      action="http://huruqing.cn:3001/admin/book/upload"
      :show-file-list="false"
      :on-success="handleAvatarSuccess"
      :before-upload="beforeAvatarUpload"
    >
      <img v-if="formData.poster" :src="formData.poster" class="avatar">
      <i v-else class="el-icon-plus avatar-uploader-icon"></i>
    </el-upload>
  </div>
</template>

<script>
export default {
  props: ["formData"],
  data() {
    return {
      poster: ""
    };
  },
  methods: {
    handleAvatarSuccess(res, file) {
      this.poster = URL.createObjectURL(file.raw);
      //获取海报的路径
      const posters = file.response.result.url;
      //传给后台数据字段
      this.formData.poster = posters;
    },
    beforeAvatarUpload(file) {
      const isJPG = file.type === "image/jpeg";
      const isLt2M = file.size / 1024 / 1024 < 2;

      if (!isJPG) {
        this.$message.error("上传头像图片只能是 JPG 格式!");
      }
      if (!isLt2M) {
        this.$message.error("上传头像图片大小不能超过 2MB!");
      }
      return isJPG && isLt2M;
    }
  }
};
</script>

<style lang="scss">
.avatar-uploader .el-upload {
  border: 1px dashed #d9d9d9;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.avatar-uploader .el-upload:hover {
  border-color: #409eff;
}
.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 138px;
  height: 138px;
  line-height: 138px;
  text-align: center;
}
.avatar {
  width: 178px;
  height: 178px;
  display: block;
}
</style>