# 数学文本

> 了解 Aspose.Slides for Node.js 的 MathematicalText 示例：在 PPT、PPTX 和 ODP 演示文稿中创建和格式化公式、分数、矩阵和符号。

Source: https://docs.aspose.com/slides/zh/nodejs-java/examples/elements/math-text/
Updated: 2026-02-19

本文演示如何使用 **Aspose.Slides for Node.js via Java** 处理数学文本形状并格式化公式。

## **添加数学文本**

创建包含分数和勾股公式的数学形状。

```js
function addMathText() {
    let presentation = new aspose.slides.Presentation();
    try {
        let slide = presentation.getSlides().get_Item(0);

        // 添加一个数学形状到幻灯片。
        let mathShape = slide.getShapes().addMathShape(0, 0, 720, 150);

        // 访问数学段落。
        let paragraph = mathShape.getTextFrame().getParagraphs().get_Item(0);
        let textPortion = paragraph.getPortions().get_Item(0);
        let mathParagraph = textPortion.getMathParagraph();

        // 添加一个简单的分数：x / y。
        let fraction = new aspose.slides.MathematicalText("x").divide("y");
        mathParagraph.add(new aspose.slides.MathBlock(fraction));

        // 添加公式：c² = a² + b²。
        let mathBlock = new aspose.slides.MathematicalText("c")
                .setSuperscript("2")
                .join("=")
                .join(new aspose.slides.MathematicalText("a").setSuperscript("2"))
                .join("+")
                .join(new aspose.slides.MathematicalText("b").setSuperscript("2"));
        mathParagraph.add(mathBlock);

        presentation.save("math_text.pptx", aspose.slides.SaveFormat.Pptx);
    } finally {
        presentation.dispose();
    }
}
```

## **访问数学文本**

在幻灯片上定位包含数学段落的形状。

```js
function accessMathText() {
    let presentation = new aspose.slides.Presentation("math_text.pptx");
    try {
        let slide = presentation.getSlides().get_Item(0);

        // 查找第一个包含数学段落的形状。
        let mathShape = null;
        for (let shapeIndex = 0; shapeIndex < slide.getShapes().size(); shapeIndex++) {
            let shape = slide.getShapes().get_Item(shapeIndex);
            if (java.instanceOf(shape, "com.aspose.slides.IAutoShape")) {
                let autoShape = shape;
                let textFrame = autoShape.getTextFrame();
                if (textFrame != null) {
                    let hasMath = false;
                    for (let paragraphIndex = 0; paragraphIndex < textFrame.getParagraphs().getCount(); paragraphIndex++) {
                        let paragraph = textFrame.getParagraphs().get_Item(paragraphIndex);
                        for (let portionIndex = 0; portionIndex < paragraph.getPortions().getCount(); portionIndex++) {
                            let portion = paragraph.getPortions().get_Item(portionIndex);
                            if (java.instanceOf(portion, "com.aspose.slides.MathPortion")) {
                                hasMath = true;
                                break;
                            }
                        }
                        if (hasMath) break;
                    }
                    if (hasMath) {
                        mathShape = autoShape;
                        break;
                    }
                }
            }
        }

        if (mathShape != null) {
            let paragraph = mathShape.getTextFrame().getParagraphs().get_Item(0);
            let textPortion = paragraph.getPortions().get_Item(0);
            let mathParagraph = textPortion.getMathParagraph();

            // ...
        }
    } finally {
        presentation.dispose();
    }
}
```

## **删除数学文本**

从幻灯片中删除数学形状。

```js
function removeMathText() {
    let presentation = new aspose.slides.Presentation("math_text.pptx");
    try {
        let slide = presentation.getSlides().get_Item(0);

        // 假设第一个形状是数学形状。
        let mathShape = slide.getShapes().get_Item(0);

        // 删除数学形状。
        slide.getShapes().remove(mathShape);

        presentation.save("math_text_removed.pptx", aspose.slides.SaveFormat.Pptx);
    } finally {
        presentation.dispose();
    }
}
```

## **格式化数学文本**

为数学部分设置字体属性。

```js
function formatMathText() {
    let presentation = new aspose.slides.Presentation("math_text.pptx");
    try {
        let slide = presentation.getSlides().get_Item(0);

        // 假设第一个形状是数学形状。
        let mathShape = slide.getShapes().get_Item(0);

        let paragraph = mathShape.getTextFrame().getParagraphs().get_Item(0);
        let textPortion = paragraph.getPortions().get_Item(0);

        textPortion.getPortionFormat().setFontHeight(20);

        presentation.save("math_text_formatted.pptx", aspose.slides.SaveFormat.Pptx);
    } finally {
        presentation.dispose();
    }
}
```