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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

WebAssembly.instantiateStreaming() function compiles and instantiates a WebAssembly module directly from a streamed underlying source. This is the most efficient, optimized way to load wasm code.

句法

Promise<ResultObject> WebAssembly.instantiateStreaming(source, importObject);
					

参数

source

A Response object or a promise that will fulfill with one, representing the underlying source of a .wasm module you want to stream, compile, and instantiate.

importObject 可选

An object containing the values to be imported into the newly-created Instance , such as functions or WebAssembly.Memory objects. There must be one matching property for each declared import of the compiled module or else a WebAssembly.LinkError is thrown.

返回值

A Promise 解析为 ResultObject which contains two fields:

• module : A WebAssembly.Module object representing the compiled WebAssembly module. This Module can be instantiated again or shared via postMessage() .
• instance : A WebAssembly.Instance object that contains all the Exported WebAssembly functions .

异常

• If either of the parameters are not of the correct type or structure, a TypeError is thrown.
• If the operation fails, the promise rejects with a WebAssembly.CompileError , WebAssembly.LinkError ，或 WebAssembly.RuntimeError , depending on the cause of the failure.

范例

Instantiating streaming

The following example (see our instantiate-streaming.html demo on GitHub, and view it live also) directly streams a .wasm module from an underlying source then compiles and instantiates it, the promise fulfilling with a ResultObject . Because the instantiateStreaming() function accepts a promise for a Response object, you can directly pass it a WindowOrWorkerGlobalScope.fetch() call, and it will pass the response into the function when it fulfills.

var importObject = { imports: { imported_func: arg => console.log(arg) } };
WebAssembly.instantiateStreaming(fetch('simple.wasm'), importObject)
.then(obj => obj.instance.exports.exported_func());
					

ResultObject 's instance member is then accessed, and the contained exported function invoked.

注意 : For this to work, .wasm files should be returned with an application/wasm MIME type by the server.

规范

规范
WebAssembly features for web embedding The definition of 'instantiateStreaming()' in that specification.

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
instantiateStreaming	Chrome 61	Edge 16	Firefox 58	IE No	Opera 47	Safari No	WebView Android 61	Chrome Android 61	Firefox Android 58	Opera Android 45	Safari iOS No	Samsung Internet Android 8.0	nodejs No

图例

完整支持

完整支持

不支持

不支持

另请参阅

• WebAssembly 概述页面
• WebAssembly 概念
• 使用 WebAssembly JavaScript API

元数据

• 最后修改： May 7, 2020

相关话题

1. 标准内置对象
2. WebAssembly
3. 方法
   1. WebAssembly.compile()
   2. WebAssembly.compileStreaming()
   3. WebAssembly.instantiate()
   4. WebAssembly.instantiateStreaming()
   5. WebAssembly.validate()
4. 相关页面：
5. WebAssembly.Module
6. WebAssembly.Global
7. WebAssembly.Instance
8. WebAssembly.Memory
9. WebAssembly.Table
10. WebAssembly.CompileError
11. WebAssembly.LinkError
12. WebAssembly.RuntimeError
13. 继承：
14. Object
15. 特性
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
16. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.valueOf()
    12. Object.setPrototypeOf()