在研究了各种预览方法后，作为总结，写了这个程序，跟大家一起分享。

After studying the various preview method, to conclude, wrote this program to share with everyone.

youdao

在研究了各种预览方法后，作为总结，写了这个程序，跟大家一起分享。

After studying the various preview method, to conclude, wrote this program to share with everyone.

youdao