Silence

console.js

import QtQuick 1.1
import QtWebKit 1.0
import com.nokia.meego 1.0

Page {
    id: root
    tools: commonTools

    WebView {
        javaScriptWindowObjects: QtObject {
            WebView.windowObjectName: "qml"

            function qmlCall() {
                console.log("This call is in QML!");
            }
        }

        html: "<script>console.log(\"This is in WebKit!\"); window.qml.qmlCall(); alert('yeah')</script>"
    }
}

The output is only "This call is in QML!"