来自 javascript 二进制字符串的 Blob

问题描述

我有一个用 FileReader.readAsBinaryString(blob) 创建的二进制字符串.

我想用这个二进制字符串中表示的二进制数据创建一个 Blob.

I want to create a Blob with the binary data represented in this binary string.

推荐答案

您使用的 blob 是否不再可用?
你必须使用 readAsBinaryString 吗?您可以改用 readAsArrayBuffer 吗?使用数组缓冲区，重新创建 blob 会容易得多.

Is the blob that you used not available for use anymore?
Do you have to use readAsBinaryString? Can you use readAsArrayBuffer instead. With an array buffer it would be much easier to recreate the blob.

如果不是，您可以通过循环遍历字符串并构建一个字节数组然后从中创建一个 blob 来重建 blob.

If not you could build back the blob by cycling through the string and building a byte array then creating a blob from it.

$('input').change(function(){
    var frb = new FileReader();
    frb.onload = function(){
        var i, l, d, array;
        d = this.result;
        l = d.length;
        array = new Uint8Array(l);
        for (var i = 0; i < l; i++){
            array[i] = d.charCodeAt(i);
        }
        var b = new Blob([array], {type: 'application/octet-stream'});
        window.location.href = URL.createObjectURL(b);
    };
    frb.readAsBinaryString(this.files[0]);
    
 
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<input type="file">

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