css控制div里的的字符串的显示，遇到\n换行，超出div的宽度也换行

let a = "北京！\n你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好你好"

.m-hooks-userinfo-signature{white-space: pre-line;}

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