如何使用Javascript计算端点(E1.x E1.y)，其中给出源、斜率和距离？

// 输入源点坐标、斜率和距离
var x1 = 1;
var y1 = 2;
var m = 0.5;
var d = 5;

// 计算端点坐标
var a = 1 + m * m;
var b = 2 * m * (y1 - m * x1);
var c = x1 * x1 + (y1 - m * x1) * (y1 - m * x1) - d * d;

var discriminant = b * b - 4 * a * c;

if (discriminant >= 0) {
  var x2_1 = (-b + Math.sqrt(discriminant)) / (2 * a);
  var x2_2 = (-b - Math.sqrt(discriminant)) / (2 * a);

  var y2_1 = m * x2_1 + (y1 - m * x1);
  var y2_2 = m * x2_2 + (y1 - m * x1);

  // 输出端点坐标
  console.log("端点1坐标：(" + x2_1 + ", " + y2_1 + ")");
  console.log("端点2坐标：(" + x2_2 + ", " + y2_2 + ")");
} else {
  console.log("无法计算端点坐标，直线与圆无交点。");
}