function dataURItoBlob(dataURI) { var byteString = atob(dataURI.split(',')[1]); var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]; var ab = new ArrayBuffer(byteString.length); var ia = new Uint8Array(ab); for (var i = 0; i < byteString.length; i...
The string to be encoded contains characters outside of the Latin1 range.(…) 原因:btoa只能转换占一个字节宽度的字符,就是Latin1字符集(它是ASCII的超集)。而中文汉字是被编码成占两个或以上个字节的。所以btoa方法无法对中文进行操作,于是就报了上面看到的错误。 Binary strings utf-16 编码 如DOMString ...
For example image data from a element. Plain text and HTML do not need this option. More. binary boolean false set to true if the data should be treated as raw content, false if this is a text. If base64 is used, this defaults to true, if the data is not a string, this will...
const base64 = btoa(String.fromCharCode.apply(null, new Uint8Array(arrayBuffer))) 6. Blob → ArrayBuffer# function blobToArrayBuffer (blob) { const reader = new FileReader() reader.readAsArrayBuffer(blob) reader.onload = () =>{ return reader.result; } } ...
repeated string memf = 6; } 但愿pbjs 对它这两种类型做了兼容,按 string 类型直接解析 binary 数据: > pbjs query_md5.proto --decode query_md5 < tmp/resp.bin > resp.json >catresp.json {"mema": {"mem1": 2,"mem2": 1048643,"mem3":"�8���z��\u0019g+���...
JavaScript 在诞生初期主要用于表单信息的处理,所以 JavaScript 天生擅长对字符串进行处理,可以看到 String 的原型提供特别多便利的字符串操作方式。 但是,在服务端如果只能操作字符是远远不够的,特别是网络和文件的一些 IO 操作上,还需要支持二进制数据流的操作,而 Node.js 的 Buffer 就是为了支持这些而存在的。好在...
String AStringmaps a JavaScript string to and from binary encodings. The length, in bytes, can be a constant, taken from a previous field in the parent structure, encoded using a number type immediately before the string. Fully supported encodings include'ascii','utf8','ucs2','utf16le','...
array:由ArrayBuffer、ArrayBufferView、Blob、DOMString等对象构成的,将会被放进Blob; options:可选的BlobPropertyBag字典,它可能会指定如下两个属性 type:默认值为 "",表示将会被放入到blob中的数组内容的 MIME 类型。 endings:默认值为"transparent",用于指定包含行结束符\n的字符串如何被写入,不常用。
like concatenation and parsing. String handling can be slower compared to working with binary data....
Node.js readable streams are easy to consume and even simple to construct. You can not only stream binary and string data but also objects and still take advantage of stream functionality. I hope you enjoyed this quick tour of readable streams, let me know if you have any questions. ...