js base64转图片保存

function base64ToImage(base64String, filename) {
    // 创建一个 a 标签用于下载
    const link = document.createElement('a');
    link.href = base64String;
    link.download = filename;

    // 将 a 标签添加到 DOM 中并触发点击事件
    document.body.appendChild(link);
    link.click();

    // 移除 a 标签
    document.body.removeChild(link);
}

// 示例 Base64 字符串
const base64Image = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA...';

// 调用函数保存图片
base64ToImage(base64Image, 'image.png');

function base64ToBlob(base64String, contentType) {
    const byteCharacters = atob(base64String.split(',')[1]);
    const byteArrays = [];
    for (let i = 0; i < byteCharacters.length; i++) {
        byteArrays.push(byteCharacters.charCodeAt(i));
    }
    return new Blob([new Uint8Array(byteArrays)], { type: contentType });
}

function downloadBlob(blob, filename) {
    const link = document.createElement('a');
    link.href = URL.createObjectURL(blob);
    link.download = filename;
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
}

const base64Image = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA...';
const blob = base64ToBlob(base64Image, 'image/png');
downloadBlob(blob, 'image.png');