javascript 无法构造“Blob”：提供的第一个参数为 null，或无效的 Array 对象。
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Failed to construct 'Blob': The 1st argument provided is either null, or an invalid Array object.
提问by cssGEEK
I started using filesaver.js today.I have created the following function:
我今天开始使用 filesaver.js。我创建了以下函数：
function saving(){
var blob = new Blob(final_transformation, {type: "text/plain;charset=utf-8"});
saveAs(blob, "hello world.txt");
}
but when i call that function i get"Failed to construct 'Blob': The 1st argument provided is either null, or an invalid Array object. " Any ideas?
但是当我调用该函数时，我得到“无法构造'Blob'：提供的第一个参数为空，或无效的数组对象。”有什么想法吗？
回答by AlienWebguy
Since you won't tell us what final_transformationis, we have to guess with no context. Try this :
由于您不会告诉我们是什么final_transformation，我们必须在没有上下文的情况下进行猜测。试试这个 ：
function saving(){
var blob = new Blob([final_transformation], {type: "text/plain;charset=utf-8"});
saveAs(blob, "hello world.txt");
}
回答by We Are All Monica
I was getting the same error.
我遇到了同样的错误。
See the Blob constructor documentation at https://developer.mozilla.org/en-US/docs/Web/API/Blob/Blob:
请参阅https://developer.mozilla.org/en-US/docs/Web/API/Blob/Blob 上的 Blob 构造函数文档：
var aBlob = new Blob( array[, options]);
arrayis anArrayofArrayBuffer,ArrayBufferView,Blob,DOMStringobjects, or a mix of any of such objects, that will be put inside theBlob.
array是Array的ArrayBuffer，ArrayBufferView，Blob，DOMString对象，或上述任何物体的混合，将被内部的放Blob。
So the first parameter to new Blobis pretty specific - it can only be an array that contains objects of several specific types. A regular string was not working for me, but this works:
所以第一个参数 tonew Blob是非常具体的——它只能是一个包含几种特定类型对象的数组。常规字符串对我不起作用，但这有效：
> new Blob( [ new TextEncoder().encode( 'some text' ) ], { type: 'text/plain' } )
< Blob {size: 9, type: "text/plain"}
