问如何检查应用程序是否是从web浏览器安装的？

EN

function checkCustomProtocol(inProtocol,inInstalLink,inTimeOut)
{
    var timeout = inTimeOut;
    window.addEventListener('blur',function(e)
        {
            window.clearTimeout(timeout);
        }
    )
    timeout = window.setTimeout(function() 
            {
              console.log('timeout');
              window.location = inInstalLink;
            }, inTimeOut
        );

    window.location = inProtocol;
}

/*
    checkCustomProtocol - check if custom protocol exists
    inProtocol - URL of application to run eg: MyApp://
    inInstallLink - URL to run when the protocol does not exist.
    inTimeOut - time in miliseconds to wait for application to Launch.
*/
function checkCustomProtocol(inProtocol,inInstalLink,inTimeOut)
{
    // Check if Microsoft Edge
    if (navigator.msLaunchUri)
    {
        navigator.msLaunchUri(inProtocol, function () 
            {
                //It launched, nothing to do
            },
        function()
            {
                window.location = inInstalLink; //Launch alternative, typically app download.
            }
        );
    }
    else
    {
        // Not Edge
        var timeout = inTimeOut;
        //Set up a listener to see if it navigates away from the page.
        // If so we assume the papplication launched
        window.addEventListener('blur',function(e)
            {
                window.clearTimeout(timeout);
            }
        )
        //Set a timeout so that if the application does not launch within the timeout we 
        // assume the protocol does not exist
        timeout = window.setTimeout(function() 
                {
                  console.log('timeout');
                  window.location = inInstalLink; //Try to launch application
                }, inTimeOut
            );

        window.location = inProtocol; //Launch alternative, typically app download.
    }
}