vue-cropper裁剪上传

效果图：

全部代码：

npm install vue-cropper     //首先 安装vue-cropper

main.js全局引用：

import VueCropper from 'vue-cropper'

Vue.use(VueCropper)

// 挂载全局

Vue.prototype.$http = httpRequest // ajax请求方法   更具自己需求来

<template>
    <div class="footerBtn">
        <img v-if="attach.laterUrl" :src="attach.laterUrl" class="preview" style="375px;height:190px"/>
        <el-button @click="dialogVisible=true">上传头像</el-button>

        <!-- 弹出层-裁剪 -->
        <el-dialog
            title="上传图片"
            :visible.sync="dialogVisible"
            :before-close="handleClose"
            width="700px"
            top
            center>
            <div>
                <el-row>
                    <el-button class="el-icon-upload" type="primary" style="padding: 13px 50px;"> 点击上传</el-button>
                    <input 
                        type="file"
                        id="uploads" 
                        accept="image/png, image/jpeg, image/gif, image/jpg"
                        @change="uploadImg($event,1)"
                        class="el-button"
                        style="margin-left: -162px;display: inline-block; 173px;margin-bottom: 15px;opacity: 0;">
                </el-row>
                <el-row>
                    <!-- <el-col :span="16"> -->
                      <el-col :span="24">
                        <!-- 裁剪 -->
                            <vueCropper
                                style="100%;height:300px"
                                ref="cropper"
                                :img="attach.customaryUrl"
                                :autoCrop="options.autoCrop"
                                :fixedBox="options.fixedBox"
                                :canMoveBox="options.canMoveBox"
                                :autoCropWidth="options.autoCropWidth"
                                :autoCropHeight="options.autoCropHeight"
                                :centerBox="options.centerBox"
                                @realTime="realTime"
                            >

                            </vueCropper>
                    </el-col>
                    <el-col :span="24">
                        <h2 align="center">头像预览</h2>
                            <div class="show-preview">
                                <div :style="previews.div" class="preview">
                                    <img style="100%" :src="previews.url" :style="previews.img">
                                </div>
                            </div>
                    </el-col>
                </el-row>
                <el-row class="footerBtn" align="center">
                    <el-button @click="handleClose">取消</el-button>
                    <el-button type="primary" @click="cut('blob')">确认</el-button>
                    
                </el-row>
            </div>
        </el-dialog>
    </div>
</template>

<script>
//数据库里需要存两份图片地址，一张为原图地址，一张为裁剪后的头像地址
export default {
    data(){
        return{
            dialogVisible:false,
            options:{
                autoCrop:true,  //默认生成截图框
                fixedBox:true,  //固定截图框大小
                canMoveBox:false,    //截图框不能拖动
                autoCropWidth:375,  //截图框宽度
                autoCropHeight:190, //截图框高度
                centerBox:false,    //截图框被限制在图片里面
            },
            previews:{}, //实时预览图数据
            attach:{ //后端附件表
                id:'',
                userId:'',
                customaryUrl:'', //原图片路径
                laterUrl:'',//裁剪后图片路径  /static/logo.png
                attachType:'photo',//附件类型
            },
            fileName:'',//本机文件地址
            uploadImgRelaPath:'',//上传后图片地址
        }
    },
    methods:{
        //控制弹出层关闭
        handleClose(){
            this.dialogVisible=false
        },
        //实时预览
        realTime(data){
            this.previews=data
        },
        //加载头像信息
        // find(){
        //     this.userId = sessionStorage.getItem('userId');
        //     this.$axios.post('/api/attach/find',this.attach).then(res=>{
        //         console.log(res);
        //     });
        // },
        //选择本地图片
        uploadImg(e,num){
            var file = e.target.files[0];
            if(!/.(gif|jpg|jpeg|png|bmp|GIF|JPG|PNG)$/.test(e.target.value)){
                this.$message.error('图片类型必须是.gif,jpeg,jpg,png,bmp中的一种');
                return false;
            }
            console.log(file.name);
            this.fileName = file.name
            //fileReader 接口，用于异步读取文件数据
            var reader = new FileReader();
            reader.readAsDataURL(file); //重要 以dataURL形式读取文件
            reader.onload = e => {
                
                    // data = window.URL.createObjectURL(new Blob([e.target.result])) 转化为blob格式
                
                let data = e.target.result
                console.log(data)
                this.attach.customaryUrl=data
                // 转化为base64
                // reader.readAsDataURL(file)
                // 转化为blob
            }
        },
        //确认截图,上传
        cut(type){
            var formData = new FormData();
            
            this.$refs.cropper.getCropBlob(res=>{
                //res是裁剪后图片的bolb对象
                console.log(res)
                formData.append("file",res,this.fileName);
                console.log(formData.append("file",res,this.fileName))
                this.$http.post('XXXXX.upload',formData,
                    {contentType: false, processData: false, headers:{'Content-Type': 'multipart/form-data'}}
                ).then(res=>{
                    console.log(res)
                })
            })
        }
    }
}
</script>

<style scoped>
/* 弹性布局 水平居中 */
.show-preview{
    width: 375px;
    height: 190px;
    display: flex;  
    justify-content: center;
    /* border:1px solid #cccccc; */
    margin: 0 auto;
    background: #f2f2f2;
   }

.preview{
    overflow: hidden;
    box-shadow: 0 0 2px 1px #666;
    background: #cccccc;
  }
.footerBtn{
    display: flex;
    justify-content: center;
    margin-top: 15px;
}

</style>
<style>
.el-dialog__body{
    padding: 0px 60px 30px 60px !important;
    z-index: 9999999;
}
.el-dialog__header {
    padding: 10px;
}
.el-button--medium {
    padding: 11px 36px;
    margin-right: 20px;
    font-size: 14px;
    border-radius: 4px;
}
</style>

更多参考链接：https://blog.csdn.net/weixin_39327044/article/details/89765109

　　　　　　　https://www.jianshu.com/p/c24ca59aaf1a

　　　　　　　https://blog.csdn.net/qq_37622575/article/details/84989424