<template>
 <div class="demo-upload-list" v-for="item in uploadList">
 <template v-if="item.status === 'finished'">
 ![](item.url)
 <div class="demo-upload-list-cover">
 <Icon type="ios-eye-outline" @click.native="handleView(item.name)"></Icon>
 <Icon type="ios-trash-outline" @click.native="handleRemove(item)"></Icon>
 </div>
 </template>
 <template v-else>
 <Progress v-if="item.showProgress" :percent="item.percentage" hide-info></Progress>
 </template>
 </div>
 <Upload
 ref="upload"
 :show-upload-list="false"
 :default-file-list="defaultList"
 :on-success="handleSuccess"
 :format="['jpg','jpeg','png']"
 :max-size="2048"
 :on-format-error="handleFormatError"
 :on-exceeded-size="handleMaxSize"
 :before-upload="handleBeforeUpload"
 multiple
 type="drag"
 action="http://jsonplaceholder.typicode.com/posts/"
 style="display: inline-block;width:58px;">
 <div style="width: 58px;height:58px;line-height: 58px;">
 <Icon type="camera" size="20"></Icon>
 </div>
 </Upload>
 <Modal title="查看圖片" v-model="visible">
 ![]('https://o5wwk8baw.qnssl.com/' + imgName + '/large')
 </Modal>
</template>
<script>
 export default {
 data () {
 return {
 defaultList: [
 {
 'name': 'a42bdcc1178e62b4694c830f028db5c0',
 'url': 'https://o5wwk8baw.qnssl.com/a42bdcc1178e62b4694c830f028db5c0/avatar'
 },
 {
 'name': 'bc7521e033abdd1e92222d733590f104',
 'url': 'https://o5wwk8baw.qnssl.com/bc7521e033abdd1e92222d733590f104/avatar'
 }
 ],
 imgName: '',
 visible: false,
 uploadList: []
 }
 },
 methods: {
 handleView (name) {
 this.imgName = name;
 this.visible = true;
 },
 handleRemove (file) {
 // 從 upload 實例刪除數據
 const fileList = this.$refs.upload.fileList;
 this.$refs.upload.fileList.splice(fileList.indexOf(file), 1);
 },
 handleSuccess (res, file) {
 // 因為上傳過程為實例，這里模擬添加 url
 file.url = 'https://o5wwk8baw.qnssl.com/7eb99afb9d5f317c912f08b5212fd69a/avatar';
 file.name = '7eb99afb9d5f317c912f08b5212fd69a';
 },
 handleFormatError (file) {
 this.$Notice.warning({
 title: '文件格式不正確',
 desc: '文件 ' + file.name + ' 格式不正確，請上傳 jpg 或 png 格式的圖片。'
 });
 },
 handleMaxSize (file) {
 this.$Notice.warning({
 title: '超出文件大小限制',
 desc: '文件 ' + file.name + ' 太大，不能超過 2M。'
 });
 },
 handleBeforeUpload () {
 const check = this.uploadList.length < 5;
 if (!check) {
 this.$Notice.warning({
 title: '最多只能上傳 5 張圖片。'
 });
 }
 return check;
 }
 },
 mounted () {
 this.uploadList = this.$refs.upload.fileList;
 }
 }
</script>
<style>
 .demo-upload-list{
 display: inline-block;
 width: 60px;
 height: 60px;
 text-align: center;
 line-height: 60px;
 border: 1px solid transparent;
 border-radius: 4px;
 overflow: hidden;
 background: #fff;
 position: relative;
 box-shadow: 0 1px 1px rgba(0,0,0,.2);
 margin-right: 4px;
 }
 .demo-upload-list img{
 width: 100%;
 height: 100%;
 }
 .demo-upload-list-cover{
 display: none;
 position: absolute;
 top: 0;
 bottom: 0;
 left: 0;
 right: 0;
 background: rgba(0,0,0,.6);
 }
 .demo-upload-list:hover .demo-upload-list-cover{
 display: block;
 }
 .demo-upload-list-cover i{
 color: #fff;
 font-size: 20px;
 cursor: pointer;
 margin: 0 2px;
 }
</style>

<template>
 <div>
 <div class="demo-upload-list" v-for="item in uploadList">
 ![](item.url)
 <div class="demo-upload-list-cover">
 <Icon type="ios-trash-outline" @click.native="handleRemove(item)"></Icon>
 </div>
 </div>
 <Upload ref="upload" :show-upload-list="false" :format="['jpg','jpeg','png']" :max-size="2048" :before-upload="handleBeforeUpload" :on-format-error="handleFormatError" :on-exceeded-size="handleMaxSize" type="drag" action="http://jsonplaceholder.typicode.com/posts/" style="display: inline-block;width:58px;">
 <div style="width: 58px;height:58px;line-height: 58px;">
 <Icon type="camera" size="20"></Icon>
 </div>
 </Upload>
 </div>
</template>
<script>
export default {
 methods: {
 data(){
 return {
 uploadList: []
 }
 },
 handleBeforeUpload(file) {
 // 創建一個 FileReader 對象
 let reader = new FileReader()
 // readAsDataURL 方法用于讀取指定 Blob 或 File 的內容
 // 當讀操作完成，readyState 變為 DONE，loadend 被觸發，此時 result 屬性包含數據：URL（以 base64 編碼的字符串表示文件的數據）
 // 讀取文件作為 URL 可訪問地址
 reader.readAsDataURL(file)

 const _this = this
 reader.onloadend = function (e) {
 file.url = reader.result
 _this.uploadList.push(file)
 }
 },
 handleRemove(file) {
 this.uploadList.splice(this.uploadList.indexOf(file), 1)
 },
 handleFormatError(file) {
 this.$Notice.warning({
 title: '文件格式不正確',
 desc: '文件 ' + file.name + ' 格式不正確，請上傳 jpg 或 png 格式的圖片。'
 })
 },
 handleMaxSize(file) {
 this.$Notice.warning({
 title: '超出文件大小限制',
 desc: '文件 ' + file.name + ' 太大，不能超過 2M。'
 })
 }
 }
}
</script>
<style scoped>
.demo-upload-list {
 display: inline-block;
 width: 60px;
 height: 60px;
 text-align: center;
 line-height: 60px;
 border: 1px solid transparent;
 border-radius: 4px;
 overflow: hidden;
 background: #fff;
 position: relative;
 box-shadow: 0 1px 1px rgba(0, 0, 0, .2);
 margin-right: 4px;
}

.demo-upload-list img {
 width: 100%;
 height: 100%;
}

.demo-upload-list-cover {
 display: none;
 position: absolute;
 top: 0;
 bottom: 0;
 left: 0;
 right: 0;
 background: rgba(0, 0, 0, .6);
}

.demo-upload-list:hover .demo-upload-list-cover {
 display: block;
}

.demo-upload-list-cover i {
 color: #fff;
 font-size: 20px;
 cursor: pointer;
 margin: 0 2px;
}

.ivu-icon {
 line-height: 58px;
}
</style>