getImgSize(str) {    //获取base64图片大小，返回KB数字    var str = base64url.replace('data:image/jpeg;base64,', '');//这里根据自己上传图片的格式进行相应修改        var strLength = str.length;    var fileLength = parseInt(strLength - (strLength / 8) * 2);    // 由字节转换为KB    var size = "";    size = (fileLength / 1024).toFixed(2);                return parseInt(size);  },

 

base64:

 

data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAASABIAAD/4QBYRXhpZxxxxxxxkopKACiiigApaSloA/9k=