<style>

#myDIV {text-align: justify; }

</style>

<div id="myDIV">

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>点击“尝试一下”按钮，改变 DIV 元素的 text-align-last 属性</p>

<button onclick="myFunction()">尝试一下</button>

<script>

function myFunction(){

    document.getElementById("myDIV").style.textAlignLast = "right";

    document.getElementById("myDIV").style.MozTextAlignLast = "right"; // 针对 Firefox 的代码