el-upload配合腾讯云cos制作文件上传组件

• • 使用组件
  • 创建组件FileUpload

使用组件

<FileUpload></FileUpload>
//文件上传
import FileUpload from "@/components/FileUpload"
Vue.component('FileUpload', FileUpload)

创建组件FileUpload

<template>
	<div class="upload-file">
		<el-upload action="#" :before-upload="handleBeforeUpload" :file-list="fileList" :limit="limit" :show-file-list="false" class="upload-file-uploader" ref="upload">
			<!-- 上传按钮 -->
			<el-button type="primary">选取文件</el-button>
			<!-- 上传提示 -->
			<div class="el-upload__tip" slot="tip" v-if="showTip">
				请上传
				<template v-if="fileSize">
					大小不超过
					<b style="color: #f56c6c">{{ fileSize }}MB</b>
				</template>
				<template v-if="fileType">
					格式为
					<b style="color: #f56c6c">{{ fileType.join('/') }}</b>
				</template>
				的文件
			</div>
		</el-upload>
		<!-- 文件列表 -->
		<ul class="upload-file-list el-upload-list el-upload-list--text">
			<template v-for="(file, index) in fileList">
				<li :key="file.uid" class="el-upload-list__item ele-upload-list__item-content">
					<el-link :href="`${file.url}`" :underline="false" target="_blank">
						<span class="el-icon-document">{{ getFileName(file.url) }}</span>
					</el-link>
					<div class="ele-upload-list__item-content-action"><el-link :underline="false" @click="handleDelete(index)" type="danger">删除</el-link></div>
				</li>
			</template>
		</ul>
	</div>
</template>

<script>
const COS = require('cos-js-sdk-v5');
const Bucket = 'yugioh-xxx';
const Region = 'ap-xxx';
//创建一个 COS SDK 实例
const cos = new COS({
	SecretId: '',
	SecretKey: ''
});
export default {
	name: 'FileUpload',
	props: {
		// 值
		value: [String, Object, Array],
		// 数量限制
		limit: {
			type: Number,
			default: 5
		},
		// 大小限制(MB)
		fileSize: {
			type: Number,
			default: 5
		},
		// 文件类型, 例如['png', 'jpg', 'jpeg']
		fileType: {
			type: Array,
			default: () => ['doc', 'xls', 'ppt', 'txt', 'pdf']
		},
		// 是否显示提示
		isShowTip: {
			type: Boolean,
			default: true
		}
	},
	data() {
		return {
			fileList: [],
			cndUrl: ''
		};
	},
	watch: {
		value: {
			handler(val) {
				if (val) {
					let temp = 1;
					// 首先将值转为数组
					const list = Array.isArray(val) ? val : this.value.split(',');
					// 然后将数组转为对象数组
					this.fileList = list.map(item => {
						if (typeof item === 'string') {
							if (item.indexOf(this.cndUrl) === -1) {
								item = { name: item, url: this.cndUrl + item };
							} else {
								item = { name: item, url: item };
							}
						}
						item.uid = item.uid || new Date().getTime() + temp++;
						return item;
					});
				} else {
					this.fileList = [];
					return [];
				}
			},
			deep: true,
			immediate: true
		}
	},
	computed: {
		// 是否显示提示
		showTip() {
			return this.isShowTip && (this.fileType || this.fileSize);
		}
	},
	methods: {
		// 上传前校检格式和大小
		handleBeforeUpload(file) {
			// 校检文件类型
			if (this.fileType) {
				let fileExtension = '';
				if (file.name.lastIndexOf('.') > -1) {
					fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1);
				}
				const isTypeOk = this.fileType.some(type => {
					if (file.type.indexOf(type) > -1) return true;
					if (fileExtension && fileExtension.indexOf(type) > -1) return true;
					return false;
				});
				if (!isTypeOk) {
					this.$message.error(`文件格式不正确, 请上传${this.fileType.join('/')}格式文件!`);
					return false;
				}
			}
			// 校检文件大小
			if (this.fileSize) {
				const isLt = file.size / 1024 / 1024 < this.fileSize;
				if (!isLt) {
					this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
					return false;
				}
			}
			this.uploadFileToTencentClound(file).then(response => {
				this.fileList.push({ name: file.uid, url: 'https://' + response });
				this.$emit('input', this.listToString(this.fileList));
			});
		},
		/**上传图片到腾讯云**/
		uploadFileToTencentClound(file) {
			return new Promise(resolve => {
				cos.putObject(
					{
						Bucket: Bucket /* 存储桶 */,
						Region: Region /* 存储桶所在地域，必须字段 */,
						Key: 'files/' + file.name /* 文件名 */,
						StorageClass: 'STANDARD', // 上传模式, 标准模式
						Body: file, // 上传文件对象
						onProgress: function(info) {
							console.log('[cos.postObject-seccess]', JSON.stringify(info));
						}
					},
					function(err, data) {
						console.log('[cos.postObject-err]', err || data);
						resolve(data.Location);
					}
				);
			});
		},
		// 删除文件
		handleDelete(index) {
			this.fileList.splice(index, 1);
			this.$emit('input', this.listToString(this.fileList));
		},
		// 获取文件名称
		getFileName(name) {
			if (name.lastIndexOf('/') > -1) {
				return name.slice(name.lastIndexOf('/') + 1).toLowerCase();
			} else {
				return '';
			}
		},
		// 对象转成指定字符串分隔
		listToString(list, separator) {
			let strs = '';
			separator = separator || ',';
			for (let i in list) {
				strs += list[i].url + separator;
			}
			return strs != '' ? strs.substr(0, strs.length - 1) : '';
		}
	}
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
	margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
	border: 1px solid #e4e7ed;
	line-height: 2;
	margin-bottom: 10px;
	position: relative;
}
.upload-file-list .ele-upload-list__item-content {
	display: flex;
	justify-content: space-between;
	align-items: center;
	color: inherit;
}
.ele-upload-list__item-content-action .el-link {
	margin-right: 10px;
}
</style>