Debugging QML
http://doc.qt.nokia.com/4.7/qdeclarativedebugging.html
主要有：
console.debug("list1 " + activeFocus) 可以加参数Debugging Transitions
When a transition doesn't look quite right, it can be helpful to view it in slow motion to see what is happening more clearly. This functionality is supported in the QML Viewer tool: to enable this, click on the "Debugging" menu, then "Slow Down Animations".
Debugging module imports
The QML_IMPORT_TRACE environment variable can be set to enable debug output from QML's import loading mechanisms.
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http://doc.qt.nokia.com/qtcreator-2.2/creator-debugging-qml.html
Debugging Qt Quick Projects
Note: You need Qt 4.7.1 or later to debug Qt Quick projects.