参看几篇博客，亲测，没什么问题
Qt的下载地址：
http://download.qt.io/
http://blog.csdn.net/cammyn/article/details/52059983
http://blog.csdn.net/u014265347/article/details/54972611
http://blog.csdn.net/qq_28093585/article/details/72678610
