手机端js点击下载图片

function downloadImage(imageUrl, fileName) {
    // 创建XMLHttpRequest对象
    var xhr = new XMLHttpRequest();
    xhr.open('GET', imageUrl, true);
    xhr.responseType = 'blob'; // 设置响应类型为blob

    xhr.onload = function() {
        if (this.status == 200) {
            // 获取blob对象
            var blob = this.response;
            var link = document.createElement('a');
            link.href = window.URL.createObjectURL(blob);
            link.download = fileName;

            // 兼容性处理
            if (document.createEvent) {
                var event = document.createEvent('MouseEvents');
                event.initEvent('click', true, true);
                link.dispatchEvent(event);
            } else {
                link.click();
            }

            // 释放URL对象
            window.URL.revokeObjectURL(link.href);
        }
    };

    xhr.send();
}

// 使用示例
downloadImage('https://example.com/image.jpg', 'my-image.jpg');