// 上传图片时限制图片的尺寸beforeUpload(file) {//进行图片类型和大小的限制const isLt10M = file.size / 1024 / 1024 < 10;if (!isLt10M) {this.$message({message: "广告图大小不能超过10M!请重新选择!",type: "warning",});return false; //必须加上return false; 才能阻止}const isSize = new Promise(function (resolve, reject) {let width = 1920;// let height = 500;let _URL = window.URL || window.webkitURL;let img = new Image();img.onload = function () {let valid =img.width == width && (img.height == 500 || img.height == 280);valid ? resolve() : reject();};img.src = _URL.createObjectURL(file);}).then(() => {return file;},() => {this.$message({message: "广告图尺寸只能是500或280*1920px!请重新选择!",type: "warning",});return Promise.reject();return false; //必须加上return false; 才能阻止});return isLt10M && isSize;},
