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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。
A WebAssembly.Instance object is a stateful, executable instance of a WebAssembly.Module. Instance objects contain all the Exported WebAssembly functions that allow calling into WebAssembly code from JavaScript.
WebAssembly.Instance实例对象是有状态，可执行的 WebAssembly.Module实例。实例中包含了所有可以被 JavaScript调用的WebAssembly 代码导出的函数。
The WebAssembly.Instance() constructor function can be called to synchronously instantiate a given WebAssembly.Module object. However, the primary way to get an Instance is through the asynchronous WebAssembly.instantiate() function.
Constructor Syntax
Important: Since instantiation for large modules can be expensive, developers should only use the Instance() constructor when synchronous instantiation is absolutely required; the asynchronous WebAssembly.instantiate() method should be used at all other times.
var myInstance = new WebAssembly.Instance(module, importObject);
Parameters
- module
- The
WebAssembly.Moduleobject to be instantiated. - importObject 可选
- An object containing the values to be imported into the newly-created
Instance, such as functions orWebAssembly.Memoryobjects. There must be one matching property for each declared import ofmoduleor else a WebAssembly.LinkError is thrown.
Instance instances
All Instance instances inherit from the Instance() constructor's prototype object — this can be modified to affect all Instance instances.
Instance properties
Instance.prototype.constructor- Returns the function that created this object's instance. By default this is the
WebAssembly.Instance()constructor. Instance.prototype.exportsRead only- Returns an object containing as its members all the functions exported from the WebAssembly module instance, to allow them to be accessed and used by JavaScript.
Instance methods
None.
Specifications
| Specification | Status | Comment |
|---|---|---|
| Web Assembly JavaScript API Instance |
Draft | Initial draft definition. |
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 57 | 15[2] | 52 (52)[1] | 未实现 | 44 | 11 |
| Feature | Chrome for Android | Android Webview | Edge Mobile | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | 57 | 57 | 未实现 | 52.0 (52)[1] | 未实现 | 未实现 | 11 |
[1] WebAssembly is enabled in Firefox 52+, although disabled in the Firefox 52 Extended Support Release (ESR.)
[2] Currently supported behind the “Experimental JavaScript Features” flag. See this blog post for more details.