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Float64Array Object

JavaScript - Internet Explorer 10

A typed array of 64-bit float values. The contents are initialized to 0. If the requested number of bytes could not be allocated an exception is raised.

float64Array = new Float64Array( length );
float64Array = new Float64Array( array );
float64Array = new Float64Array( buffer, byteOffset, length);

Parameters

float64Array: Required. The variable name to which the Float64Array object is assigned.
length: Specifies the length (in bytes) of the array.
array: The array (or typed array) that is contained in this array.. The contents are initialized to the contents of the given array or typed array, with each element converted to the Float64 type.
buffer: The ArrayBuffer that the Float64Array represents.
byteOffset: Optional. Specifies the offset in bytes from the start of the buffer at which the Float64Array should begin.
length: The length of the array.

Constants

The following table lists the constants of the Float64Arrayobject.

Constant	Description
BYTES_PER_ELEMENT Constant	The size in bytes of each element in the array.

Properties

The following table lists the constants of the Float64Arrayobject.

Property	Description
buffer Property	Read-only. Gets the ArrayBuffer that is referenced by this array.
byteLength Property	Read-only. The length of this array from the start of its ArrayBuffer, in bytes, as fixed at construction time.
byteOffset Property	Read-only. The offset of this array from the start of its ArrayBuffer, in bytes, as fixed at construction time.
length Property	The length of the array.

Methods

The following table lists the methods of the Float64Arrayobject.

Method	Description
get Method	Omittable. Gets the element at the specified index.
set Method (Float64Array)	Sets a value or an array of values.
subarray Method (Float64Array)	Gets a new Float64Array view of the ArrayBuffer store for this array.

Example

The following example shows how to use a Float64Array object to process the binary data acquired from an XmlHttpRequest:

JavaScript

var req = new XMLHttpRequest();
    req.open('GET', "http://www.example.com");
    req.responseType = "arraybuffer";
    req.send();

    req.onreadystatechange = function () {
        if (req.readyState === 4) {
            var buffer = req.response;
            var dataview = new DataView(buffer);
            var ints = new Float64Array(buffer.byteLength / 8);
            for (var i = 0; i < ints.length; i++) {
                ints[i] = dataview.getFloat64(i * 8);
            }
        alert(ints[10]);
        }
    }

Requirements

Supported in the Internet Explorer 10 standards document mode. Also supported in Windows Store apps. See Version Information.

Not supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards.

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