切换按钮打印双精度值

<button id="toggleButton">切换按钮</button>

var toggleButton = document.getElementById("toggleButton");
var isDoublePrecision = false;

toggleButton.addEventListener("click", function() {
  isDoublePrecision = !isDoublePrecision;
  
  if (isDoublePrecision) {
    var doubleValue = 3.141592653589793;
    console.log(doubleValue);
  }
});

const express = require("express");
const app = express();

app.post("/printDoubleValue", (req, res) => {
  var doubleValue = 3.141592653589793;
  console.log(doubleValue);
  
  res.sendStatus(200);
});

app.listen(3000, () => {
  console.log("Server is running on port 3000");
});

var toggleButton = document.getElementById("toggleButton");
var isDoublePrecision = false;

toggleButton.addEventListener("click", function() {
  isDoublePrecision = !isDoublePrecision;
  
  if (isDoublePrecision) {
    fetch("/printDoubleValue", {
      method: "POST"
    })
    .then(response => {
      if (response.ok) {
        console.log("Double value printed successfully");
      }
    })
    .catch(error => {
      console.error("Error printing double value:", error);
    });
  }
});