图片404 js Promise 替换图片

function CheckImgExists(imgurl,newUrl) {
			return new Promise(function(resolve, reject) {
				var ImgObj = new Image(); //判断图片是否存在
				ImgObj.src = imgurl;
				ImgObj.onload = function(res) {
					resolve(res);
				}
				ImgObj.onerror = function(err) {
					console.log("图片出错，替换图片")
					
					console.log(newUrl);
					reject(err)
				}
			}).catch((e) => {});
		}