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function generateShapes() {
    let rows = document.getElementById("rows").value;
    let shapesDiv = document.getElementById("shapes");
    shapesDiv.innerHTML = "";
    // 生成三角形
    for (let i = 1; i <= rows; i++) {
        shapesDiv.innerHTML += "&nbsp".repeat(rows - i) + "&nbsp *".repeat(i) + "<br>";
    }
    shapesDiv.innerHTML += "<br>";

    // 生成平行四边形
    for (let i = 1; i <= rows; i++) {
        shapesDiv.innerHTML += "&nbsp".repeat(rows - i) + "&nbsp *".repeat(rows) + "<br>";
    }
    shapesDiv.innerHTML += "<br>";

    // 生成菱形
    for (let i = 1; i <= rows; i++) {
        shapesDiv.innerHTML += "&nbsp&nbsp;".repeat(rows - i) + "&nbsp;*".repeat(i * 2 - 1) + "<br>";
    }
    for (let i = rows - 1; i >= 1; i--) {
        shapesDiv.innerHTML += "&nbsp&nbsp;".repeat(rows - i) + "&nbsp;*".repeat(i * 2 - 1) + "<br>";
    }
}