vue中上傳圖片限制大小、寬高

imgReady(data.object, function () {
    if(this.width < 360 || this.height < 360) {
        document.getElementById("myImageShow").src = "../../public/img/background.png";
        alert("圖片大小不能低於360*360PX");
    }
    if(this.width != this.height) {
        document.getElementById("myImageShow").src = "../../public/img/background.png";
        alert("上傳圖片比例為1:1");
    }
});