WebAssembly.Table.prototype.get() - JavaScript 编辑

The get() prototype method of the WebAssembly.Table() object retrieves a function reference stored at a given index.

Syntax

table.get(index);

Parameters

index

The index of the function reference you want to retrieve.

Return value

A function reference — this is an exported WebAssembly function, a JavaScript wrapper for an underlying wasm function.

Exceptions

If index is greater than or equal to Table.prototype.length, a RangeError is thrown.

Examples

Using get

The following example (see table.html on GitHub, and view it live also) compiles and instantiates the loaded table.wasm byte code using the WebAssembly.instantiateStreaming() method. It then retrieves the references stored in the exported table.

WebAssembly.instantiateStreaming(fetch('table.wasm'))
.then(function(obj) {
  var tbl = obj.instance.exports.tbl;
  console.log(tbl.get(0)());  // 13
  console.log(tbl.get(1)());  // 42
});

Note how you've got to include a second function invocation operator at the end of the accessor to actually retrieve the value stored inside the reference (e.g. get(0)() rather than get(0)) — it is a function rather than a simple value.

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• WebAssembly overview page
• WebAssembly concepts
• Using the WebAssembly JavaScript API