样式

<!--
 * @Author: czz
 * @Date: 2022-05-05 11:27:11
 * @LastEditTime: 2022-05-27 13:44:40
 * 用法：传入url显示图片，绑定事件change返回对象包含图片文件和图片base64
-->
<template>
    <div class="uploadCover">
        <input type="file" @change="uploadChange($event)" ref="upload" accept="image/jpg, image/jpeg, image/png">
        <div class="upload" @click="clickToUpload">
            <div @click="lookImgs($event)" class="imgs" v-viewer v-show="img" :style="{opacity:loading?'0.5':'1'}">
                <img :src="img" alt="">
                <img id="img_del" src="../assets/[email protected]" alt="" @click="deleteImg($event)">
            </div>
            <div class="addImg" v-show="loading?true:img?false:true">
                <a-spin :indicator="indicator" v-show="loading"/>
                <img src="../assets/addImg.png" v-show="!loading" alt="图片不见了"><br>
                <span v-if="!img">上传封面</span>
            </div>
        </div>
    </div>
</template>

<script>
export default {
    props:{
        url:'',
    },
    data(){
        return{
            indicator: <a-icon type="loading" style="color:#aaa;font-size: 24px" spin />,
            img:'',//图片url
            file:null,
            loading:false,
        }
    },
    created(){

    },
    mounted(){

    },
    watch:{
        url:{
            immediate:true,
            handler(newVal,oldVal){
                this.img = newVal
            },
            deep:true,
        }
    },
    methods:{
        lookImgs(e){
            e.stopPropagation()
            // console.log(111);
        },
        //点击上传封面div
        clickToUpload(e){
            // console.log(e);
            if(this.loading){
                e.preventDefault()
            }else{
                //点击div触发input的点击事件
                this.$refs.upload.click()
            }
        },
        //点击删除图片
        deleteImg(e){
            e.stopPropagation()//阻止冒泡
            if(!this.loading){
                this.img = ''
                this.$emit('delete',true)
            }
        },
        //把图片转换成base64(用来临时显示)
        getBase64(img, callback) {
            const reader = new FileReader();
            reader.addEventListener('load', () => callback(reader.result));
            reader.readAsDataURL(img);
        },
        //上传图片change事件
        uploadChange(e){
            // console.log(e.target.files);
            this.loading = true
            if(e.target.files.length>0){
                //选择图片继续执行
                let filesArr = e.target.files
                this.getBase64(filesArr[0],imageUrl=>{
                    // imgurl = imageUrl
                    this.img = imageUrl
                    this.file = filesArr[0]
                    let file = new FormData()
                    file.append("file",this.file)
                    this.loading = false
                    this.$emit('change',{filesArr:this.file,imgBase64:this.img,file:file})
                    this.$refs.upload.value = null;
                })
            }else{
                //选择了“取消”
                this.loading = false
            }
        },
    }
}
</script>

<style lang="less">
.uploadCover{
    width: 100%;
    height: 100%;
    input{
        float: left;
        opacity: 0;
        width: 0;
    }
    .upload{
        float: left;
        z-index: 10;
        margin-top: 0px;
        margin-left: 0px;
        // width: 504px;
        // height: 285.25px;
        width: 100%;
        height: 100%;
        box-sizing: normal;
        padding: 2px;
        cursor: pointer;
        border: 1px dashed #ccc;
        border-radius: 5px;
        position: relative;
        &:active{
            opacity: 0.5;
        }
        .imgs{
            width: 100%;
            height: 100%;
            position: relative;
            img{
                width: 100%;
                height: 100%;
            }
            #img_del{
                position: absolute;
                right: 5px;
                top: 5px;
                font-size: 30px;
                color: #fff;
                border-radius: 50%;
                background: #aaa;
                width: 16px;
                height: 16px;
            }
        }
        .addImg{
            width: 100px;
            height: 50px;
            position: absolute;
            top: calc(50% - 25px);
            left: calc(50% - 50px);
            text-align: center;
            img{
                width: 24px;
                height: 24px;
            }
        }
    }
}
</style>