注意:一定要指定容器的宽度(width),否则没用。 实例<p class="p1">1.This is a dog.This is a dog.This is a dog.只对英文起作用,以字母作为换行依据</p><p class="p2">2.This is a dog.This is a dog.This is a dog.只对英文起作用,以单词作为换行依据</p><p class="p3">3.This is a dog.This is a dog.This is a dog.只对中文起作用,强制换行</p><p class="p4">4.This is a dog.强制不换行,都起作用</p><p class="p5">5.不换行,超出部分隐藏且以省略号形式出现</p>word-break 语法word-break : normal | break-all | keep-all
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