js判断图片url地址

function checkImageUrl(url) {
    return new Promise((resolve, reject) => {
        const img = new Image();
        img.onload = () => resolve(true); // 图片加载成功
        img.onerror = () => resolve(false); // 图片加载失败
        img.src = url;
    });
}

// 使用示例
const imageUrl = 'https://example.com/image.jpg';
checkImageUrl(imageUrl).then(isValid => {
    if (isValid) {
        console.log('图片地址有效');
    } else {
        console.log('图片地址无效');
    }
});

function checkImageUrlWithTimeout(url, timeout = 5000) {
    return new Promise((resolve, reject) => {
        const img = new Image();
        const timer = setTimeout(() => {
            resolve(false); // 超时处理
        }, timeout);

        img.onload = () => {
            clearTimeout(timer);
            resolve(true);
        };
        img.onerror = () => {
            clearTimeout(timer);
            resolve(false);
        };
        img.src = url;
    });
}

// 服务器端设置CORS头的示例（Node.js）
app.use((req, res, next) => {
    res.header('Access-Control-Allow-Origin', '*');
    next();
});