byteLength Property (Float64Array)

Read-only. The length of this array from the start of its ArrayBuffer, in bytes, as fixed at construction time.


var arrayByteLength = float64Array.byteLength;  


The following example shows how to get the byte length of the array.

var req = new XMLHttpRequest();'GET', "");  
    req.responseType = "arraybuffer";  

    req.onreadystatechange = function () {  
        if (req.readyState === 4) {  
            var buffer = req.response;  
            var dataView = new DataView(buffer);  
            var floatArr = new Float64Array(buffer.byteLength / 8);  


Supported in the following document modes: Internet Explorer 10 standards and Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). 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.