使用el-upload图片上传校验图片的width与height

淩亂°似流年 2022-11-27 06:46 109阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk5NDczMQ_size_16_color_FFFFFF_t_70_pic_center]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk5NDczMQ_size_16_color_FFFFFF_t_70_pic_center 1]

<el-upload
                                        class="avatar-uploader"
                                        ref="haiRef"
                                        :action="uploadHaiPic"
                                        :show-file-list="false"
                                        :on-success="handleAvatarSuccess"
                                        :before-upload="beforeAvatarUpload"
                                        :headers="headerObj">
                                    <div slot="trigger" class="upload-pic" v-if="teachObj.poster">
                                        <img class="delete-icon" @click.stop="handleRemoveHai" :src="deleteIcon" />
                                        <img  :src="teachObj.poster" class="avatar-img">
                                    </div>
    
                                    
                                    <div slot="trigger" class="upload-btn" v-else>
                                        <i class="el-icon-plus"></i>
                                        <div>图片上传格式为jpg , gif , png , jpeg ，图片尺
                                            寸限制为600*480，限制大小为5M。</div>
                                    </div>
                                </el-upload>

beforeAvatarUpload(file){
               
                const isJPG =
                    file.type === 'image/jpeg' ||
                    'image/jpg' ||
                    'image/gif' ||
                    'image/png';
                const isLt5M = file.size / 1024 / 1024 < 5;
                if (!isJPG) {
                    this.$message.error(
                        '上传头像图片只能是 JPG、JPEG、GIF或PNG 格式!'
                    );
                }
                if (!isLt5M) {
                    this.$message.error('上传头像图片大小不能超过 5MB!');
                }
                // 上传图片前处理函数
                const isSize = new Promise(function(resolve, reject) {
                    let width = 600;
                    let height = 480;
                    let _URL = window.URL || window.webkitURL;
                    let image = new Image();
                    image.onload = function() {
                        let valid = image.width <= width && image.height <= height;
                        valid ? resolve() : reject();
                    };
                    image.src = _URL.createObjectURL(file);
                }).then(
                    () => {
                        return file;
                    },
                    () => {
                        this.$message.error("上传宣讲海报图片尺寸不符合,只能是600*480!");
                        return Promise.reject();
                    }
                );
    
                return isJPG && isLt5M && isSize;
            },

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk5NDczMQ_size_16_color_FFFFFF_t_70_pic_center]: /images/20221124/7549abea966e4572be1e350b3647bb70.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk5NDczMQ_size_16_color_FFFFFF_t_70_pic_center 1]: /images/20221124/0a41c6da2d604818a2c836eb8eacef41.png