1.如何使用？点击上传

通过 slot 你可以传入自定义的上传按钮类型和文字提示。可通过设置limit和on-exceed来限制上传文件的个数和定义超出限制时的行为。可通过设置before-remove来阻止文件移除操作。

<el-uploadclass="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>
<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) {console.log(file, 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>

2.用户头像上传

使用 before-upload 限制用户上传的图片格式和大小。

<el-uploadclass="avatar-uploader"action="https://jsonplaceholder.typicode.com/posts/":show-file-list="false":on-success="handleAvatarSuccess":before-upload="beforeAvatarUpload"><img v-if="imageUrl" :src="imageUrl" class="avatar"><i v-else class="el-icon-plus avatar-uploader-icon"></i>
</el-upload><style>.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: 178px;height: 178px;line-height: 178px;text-align: center;}.avatar {width: 178px;height: 178px;display: block;}
</style><script>export default {data() {return {imageUrl: ''};},methods: {handleAvatarSuccess(res, file) {this.imageUrl = URL.createObjectURL(file.raw);},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>

3.照片墙

使用 list-type 属性来设置文件列表的样式。

<el-uploadaction="https://jsonplaceholder.typicode.com/posts/"list-type="picture-card":on-preview="handlePictureCardPreview":on-remove="handleRemove"><i class="el-icon-plus"></i>
</el-upload>
<el-dialog :visible.sync="dialogVisible"><img width="100%" :src="dialogImageUrl" alt="">
</el-dialog>
<script>export default {data() {return {dialogImageUrl: '',dialogVisible: false};},methods: {handleRemove(file, fileList) {console.log(file, fileList);},handlePictureCardPreview(file) {this.dialogImageUrl = file.url;this.dialogVisible = true;}}}
</script>

4.文件缩略图

使用 scoped-slot 去设置缩略图模版。

<el-uploadaction="#"list-type="picture-card":auto-upload="false"><i slot="default" class="el-icon-plus"></i><div slot="file" slot-scope="{file}"><imgclass="el-upload-list__item-thumbnail":src="file.url" alt=""><span class="el-upload-list__item-actions"><spanclass="el-upload-list__item-preview"@click="handlePictureCardPreview(file)"><i class="el-icon-zoom-in"></i></span><spanv-if="!disabled"class="el-upload-list__item-delete"@click="handleDownload(file)"><i class="el-icon-download"></i></span><spanv-if="!disabled"class="el-upload-list__item-delete"@click="handleRemove(file)"><i class="el-icon-delete"></i></span></span></div>
</el-upload>
<el-dialog :visible.sync="dialogVisible"><img width="100%" :src="dialogImageUrl" alt="">
</el-dialog>
<script>export default {data() {return {dialogImageUrl: '',dialogVisible: false,disabled: false};},methods: {handleRemove(file) {console.log(file);},handlePictureCardPreview(file) {this.dialogImageUrl = file.url;this.dialogVisible = true;},handleDownload(file) {console.log(file);}}}
</script>

5.图片列表缩略图

<el-uploadclass="upload-demo"action="https://jsonplaceholder.typicode.com/posts/":on-preview="handlePreview":on-remove="handleRemove":file-list="fileList"list-type="picture"><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>
<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) {console.log(file, fileList);},handlePreview(file) {console.log(file);}}}
</script>

6.上传文件列表控制

通过 on-change 钩子函数来对列表进行控制

<el-uploadclass="upload-demo"action="https://jsonplaceholder.typicode.com/posts/":on-change="handleChange":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>
<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: {handleChange(file, fileList) {this.fileList = fileList.slice(-3);}}}
</script>

7.拖拽上传

<el-uploadclass="upload-demo"dragaction="https://jsonplaceholder.typicode.com/posts/"multiple><i class="el-icon-upload"></i><div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div><div class="el-upload__tip" slot="tip">只能上传jpg/png文件，且不超过500kb</div>
</el-upload>

8.手动上传

<el-uploadclass="upload-demo"ref="upload"action="https://jsonplaceholder.typicode.com/posts/":on-preview="handlePreview":on-remove="handleRemove":file-list="fileList":auto-upload="false"><el-button slot="trigger" size="small" type="primary">选取文件</el-button><el-button style="margin-left: 10px;" size="small" type="success" @click="submitUpload">上传到服务器</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>
<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: {submitUpload() {this.$refs.upload.submit();},handleRemove(file, fileList) {console.log(file, fileList);},handlePreview(file) {console.log(file);}}}
</script>

关于上传组件的大致内容就是这些，需要继续深入浅出的，可前往上传组件

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