BlobBuilder

已废弃: 该特性已经从 Web 标准中删除，虽然一些浏览器目前仍然支持它，但也许会在未来的某个时间停止支持，请尽量不要使用该特性。

Experimental: 这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。

The BlobBuilder interface provides an easy way to construct Blob objects. Just create a BlobBuilder and append chunks of data to it by calling the append() method. When you're done building your blob, call getBlob() to retrieve a Blob containing the data you sent into the blob builder.

注：BlobBuilder接口已经废弃，请使用新版草案中引入的 Blob构造函数。

方法概述

void append(in ArrayBuffer data);

void append(in Blob data);

void append(in String data, [optional] in String endings);

Blob getBlob([optional] in DOMString contentType);

File getFile(in DOMString name, [optional] in DOMString contentType);

方法

append()

Appends the contents of the specified JavaScript object to the Blob being built. If the value you specify isn't a Blob, ArrayBuffer, or String, the value is coerced to a string before being appended to the blob.

void append(
  in ArrayBuffer data
);

void append(
  in Blob data
);


void append(
  in String data,
  [optional] in String endings
);

参数

data: The data to append to the Blob being constructed.
endings: Specifies how strings containing \n are to be written out. This can be "transparent" (endings unchanged) or "native" (endings changed to match host OS filesystem convention). The default value is "transparent".

getBlob()

Returns the Blob object that has been constructed using the data passed through calls to append().

Blob getBlob(
  in DOMString contentType 可选
);

参数

contentType 可选: The MIME type of the data to be returned in the Blob. This will be the value of the Blob object's type property.

返回值

A Blob object containing all of the data passed to any calls to append() made since the BlobBuilder was created. This also resets the BlobBuilder so that the next call to append() is starting a new, empty blob.

getFile() Non-Standard

返回一个File对象。

File getFile(
  in DOMString name,
  [optional] in DOMString contentType
);

参数

name: 文件名。
contentType 可选: 设置返回的File对象中的数据的 MIME 类型。这个值将会成为返回的File对象的 type 属性的值。

返回值

一个File对象。

浏览器兼容性

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