1. If you want the space in "how are you" to be effective: you need to add word-spacing:20px;
2. After fixing the width of the div, do you want the text inside to overflow? or hidden: You need to set text-overflow:ellipsis;overflow:hidden; white-space:pre;//Wrap when encountering a blank line
4. Break according to the attributes of the word word-break:break-all;//Wrap according to the width, regardless of whether the word is written completely Line break immediately.
5. This line break is similar to the one above: word-wrap:break-word;