CSS 参考手册尝试一下

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<!DOCTYPE html>
<html>
<head>
<style>
div
{
text-align: justify;
text-align-last: right;
-moz-text-align-last: right; /* 针对 Firefox 的代码 */
}
</style>
</head>

<body>
<div>
You can use the text-align-last property to align the last line of a text, if the text has the text-align property set to justify. This text is where you will see the result of the  text-align-last property. You can use the text-align-last property to align the last line of a text, if the text has the text-align property set to justify. This text is where you will see the result of the  text-align-last property.
You can use the text-align-last property to align the last line of a text, if the text has the text-align property set to justify. This text is where you will see the result of the  text-align-last property.
You can use the text-align-last property to align the last line of a text, if the text has the text-align property set to justify. This text is where you will see the result of the  text-align-last property.
You can use the text-align-last property to align the last line of a text, if the text has the text-align property set to justify. This text is where you will see the result of the  text-align-last property.
You can use the text-align-last property to align the last line of a text, if the text has the text-align property set to justify. This text is where you will see the result of the  text-align-last property.
You can use the text-align-last property to align the last line of a text, if the text has the text-align property set to justify. This text is where you will see the result of the  text-align-last property.
You can use the text-align-last property to align the last line of a text, if the text has the text-align property set to justify. This text is where you will see the result of the  text-align-last property.
</div>

<p><b>注意：</b>只有 Internet Explorer 支持 text-align-last 属性。</p>
<p><b>注意：</b>Firefox 支持另一个可替代该属性的属性，即 -moz-text-align-last 属性。</p>

</body>
</html>