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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

set() prototype method of the WebAssembly.Table object mutates a reference stored at a given index to a different value.

句法

table.set(index, value);
					

参数

index

The index of the function reference you want to mutate.

value

The value you want to mutate the reference to. This must be an exported WebAssembly function , a JavaScript wrapper for an underlying wasm function.

返回值

Void.

异常

• 若 index is greater than or equal to Table.prototype.length ， RangeError is thrown.
• 若 value is not an exported WebAssembly function or null ， TypeError is thrown.

范例

Using Table.set

The following example (see table2.html source code and live version ) creates a new WebAssembly Table instance with an initial size of 2 references. We then print out the table length and contents of the two indexes (retrieved via Table.prototype.get() ) to show that the length is two, and the indexes currently contain no function references (they currently return null ).

var tbl = new WebAssembly.Table({initial:2, element:"anyfunc"});
console.log(tbl.length);
console.log(tbl.get(0));
console.log(tbl.get(1));
					

We then create an import object that contains a reference to the table:

var importObj = {
  js: {
    tbl:tbl
  }
};
					

Finally, we load and instantiate a wasm module (table2.wasm) using the WebAssembly.instantiateStreaming() , log the table length, and invoke the two referenced functions that are now stored in the table (the table2.wasm module (see text representation ) adds two function references to the table, both of which print out a simple value):

WebAssembly.instantiateStreaming(fetch('table2.wasm'), importObject)
.then(function(obj) {
  console.log(tbl.length);
  console.log(tbl.get(0)());
  console.log(tbl.get(1)());
});
					

Note how you've got to include a second function invocation operator at the end of the accessor to actually invoke the referenced function and log the value stored inside it (e.g. get(0)() 而不是 get(0) ).

This example shows that we're creating and accessing the table from JavaScript, but the same table is visible and callable inside the wasm instance too.

规范

规范
WebAssembly JavaScript 接口 The definition of 'set()' 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
set	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()