您可以使用word-spacing属性.它定义了单词之间的间隔.如果将其设置为容器的大小，则会强制换行...

You can use the word-spacing property. It defines the space between the words. If you set it to the size of the container, it will force a line break...

由于它不接受百分比值，因此可以使用vw之类的相对值.

Since it doesn't accept percentual values, you can use relative values like vw.

div {
    word-spacing: 100vw;
}

http://jsfiddle.net/ApL3h/