vue如何判断图片已经加载完成？

const imgs = [

'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000',
'https://inews.gtimg.com/newsapp_bt/0/9906123226/1000'

];

function ready(pics) {

const picsAll = pics.map((imgurl) => {
    imgurl = imgurl + '?v=' + Math.random(); // 仅是为了区分下不同的图片链接
    return new Promise((resolve, reject) => {
        const img = new Image();
        img.src = imgurl;
        img.onload = () => resolve(imgurl);
        img.onerror = () => reject(new Error(imgurl + ' load error'));
    })
});
Promise.all(picsAll).then(() => {
    console.log('load all success');
}).catch((e) => {
    console.log(e);
})

}