base64字符串转二进制流文件

// Base64字符串

var base64String = "SGVsbG8gV29ybGQh"; // Hello World!的base64编码

// 创建Uint8Array类型的视图来存储二进制数据

var binaryData = atob(base64String);

var len = binaryData.length;

var bytes = new Uint8Array(len);

for (var i = 0; i < len; ++i) {

bytes[i] = binaryData.charCodeAt(i);

}

// 创建Blob对象

var blob = new Blob([bytes], { type: 'text/plain' });

console.log("成功生成Blob对象！");

console.dir(blob);