在给定一组x和y坐标的情况下，在javascript中获取曲线的方程。

function fitCurve(x, y, degree) {
  // 创建矩阵A和向量b
  var A = [];
  for (var i = 0; i < x.length; i++) {
    var row = [];
    for (var j = 0; j <= degree; j++) {
      row.push(Math.pow(x[i], j));
    }
    A.push(row);
  }
  var b = y.map(function(value) {
    return [value];
  });

  // 使用最小二乘法求解方程Ax=b
  var AT = numeric.transpose(A);
  var ATA = numeric.dot(AT, A);
  var ATb = numeric.dot(AT, b);
  var coefficients = numeric.solve(ATA, ATb);

  // 构建拟合曲线的方程
  var equation = "y = ";
  for (var i = 0; i <= degree; i++) {
    equation += coefficients[i][0] + "x^" + i + " + ";
  }
  equation = equation.slice(0, -3); // 去除最后的 "+ "

  return equation;
}

// 示例数据
var x = [1, 2, 3, 4, 5];
var y = [2, 4, 6, 8, 10];

// 拟合二次曲线
var equation = fitCurve(x, y, 2);
console.log(equation); // 输出：y = 0x^0 + 0x^1 + 2x^2