在此页

• 描述
• 构造函数特性
• 静态方法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

WebAssembly JavaScript 对象充当名称空间为所有 WebAssembly 相关功能。在该规范中的 load 定义。

不像大多数其它全局对象， WebAssembly 不是构造函数 (它不是函数对象)。可以比较它与 Math , which is also a namespace object for mathematical constants and functions, or to Intl which is the namespace object for internationalization constructors and other language-sensitive functions.

描述

The primary uses for the WebAssembly object are:

• Loading WebAssembly code, using the WebAssembly.instantiate() 函数。
• Creating new memory and table instances via the WebAssembly.Memory() / WebAssembly.Table() 构造函数。
• Providing facilities to handle errors that occur in WebAssembly via the WebAssembly.CompileError() / WebAssembly.LinkError() / WebAssembly.RuntimeError() 构造函数。

构造函数特性

WebAssembly.CompileError()

Indicates an error during WebAssembly decoding or validation.

WebAssembly.Global()

Represents a global variable instance, accessible from both JavaScript and importable/exportable across one or more WebAssembly.Module instances. This allows dynamic linking of multiple modules.

WebAssembly.Instance()

Is a stateful, executable instance of a WebAssembly.Module

WebAssembly.LinkError()

Indicates an error during module instantiation (besides traps from the start function).

WebAssembly.Memory()

An object whose buffer property is a resizable ArrayBuffer that holds the raw bytes of memory accessed by a WebAssembly Instance .

WebAssembly.Module()

Contains stateless WebAssembly code that has already been compiled by the browser and can be efficiently shared with Workers , and instantiated multiple times.

WebAssembly.RuntimeError()

Error type that is thrown whenever WebAssembly specifies a trap .

WebAssembly.Table()

An array-like structure representing a WebAssembly Table, which stores function references.

静态方法

WebAssembly.instantiate()

The primary API for compiling and instantiating WebAssembly code, returning both a Module and its first Instance .

WebAssembly.instantiateStreaming()

Compiles and instantiates a WebAssembly module directly from a streamed underlying source, returning both a Module and its first Instance .

WebAssembly.compile()

Compiles a WebAssembly.Module from WebAssembly binary code, leaving instantiation as a separate step.

WebAssembly.compileStreaming()

compiles a WebAssembly.Module directly from a streamed underlying source, leaving instantiation as a separate step.

WebAssembly.validate()

Validates a given typed array of WebAssembly binary code, returning whether the bytes are valid WebAssembly code ( true ) or not ( false ).

范例

Stream a .wasm module then compile and instantiate it

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.

规范

规范
WebAssembly JavaScript 接口 在该规范中的 WebAssembly 定义。

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
WebAssembly	Chrome 57	Edge 16	Firefox 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	IE No	Opera 44	Safari 11	WebView Android 57	Chrome Android 57	Firefox Android 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android 43	Safari iOS 11	Samsung Internet Android 7.0	nodejs 8.0.0
CompileError	Chrome 57	Edge 16	Firefox 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	IE No	Opera 44	Safari 11	WebView Android 57	Chrome Android 57	Firefox Android 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android 43	Safari iOS 11	Samsung Internet Android 7.0	nodejs 8.0.0
Global	Chrome 69	Edge No	Firefox 62	IE No	Opera No	Safari No	WebView Android 69	Chrome Android 69	Firefox Android 62	Opera Android No	Safari iOS No	Samsung Internet Android 10.0	nodejs No
Instance	Chrome 57	Edge 16	Firefox 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	IE No	Opera 44	Safari 11	WebView Android 57	Chrome Android 57	Firefox Android 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android 43	Safari iOS 11	Samsung Internet Android 7.0	nodejs 8.0.0
LinkError	Chrome 57	Edge 16	Firefox 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	IE No	Opera 44	Safari 11	WebView Android 57	Chrome Android 57	Firefox Android 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android 43	Safari iOS 11	Samsung Internet Android 7.0	nodejs 8.0.0
Memory	Chrome 57	Edge 16	Firefox 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	IE No	Opera 44	Safari 11	WebView Android 57	Chrome Android 57	Firefox Android 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android 43	Safari iOS 11	Samsung Internet Android 7.0	nodejs 8.0.0
Module	Chrome 57	Edge 16	Firefox 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	IE No	Opera 44	Safari 11	WebView Android 57	Chrome Android 57	Firefox Android 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android 43	Safari iOS 11	Samsung Internet Android 7.0	nodejs 8.0.0
RuntimeError	Chrome 57	Edge 16	Firefox 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	IE No	Opera 44	Safari 11	WebView Android 57	Chrome Android 57	Firefox Android 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android 43	Safari iOS 11	Samsung Internet Android 7.0	nodejs 8.0.0
Table	Chrome 57	Edge 16	Firefox 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	IE No	Opera 44	Safari 11	WebView Android 57	Chrome Android 57	Firefox Android 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android 43	Safari iOS 11	Samsung Internet Android 7.0	nodejs 8.0.0
compile	Chrome 57	Edge 16	Firefox 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	IE No	Opera 44	Safari 11	WebView Android 57	Chrome Android 57	Firefox Android 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android 43	Safari iOS 11	Samsung Internet Android 7.0	nodejs 8.0.0
compileStreaming	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
instantiate	Chrome 57	Edge 16	Firefox 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	IE No	Opera 44	Safari 11	WebView Android 57	Chrome Android 57	Firefox Android 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android 43	Safari iOS 11	Samsung Internet Android 7.0	nodejs 8.0.0
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
validate	Chrome 57	Edge 16	Firefox 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	IE No	Opera 44	Safari 11	WebView Android 57	Chrome Android 57	Firefox Android 52 52 Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android 43	Safari iOS 11	Samsung Internet Android 7.0	nodejs 8.0.0

图例

完整支持

完整支持

不支持

不支持

见实现注意事项。

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()