说明：  功能实现了创建并显示词云， 如果空间足够，就全部显示。如果词太多，就按频率显示，频率越高的词越大。
(The function implements the creation and display of word clouds, and if space is sufficient, it will be displayed. If there are too many words, it is shown by frequency that the higher the frequency is, the greater the word is.)