防止用户在一行中输入相同的数字时提交表单

<form>
  <input type="text" id="input1" />
  <input type="text" id="input2" />
  <input type="submit" onclick="validateForm(event)" />
</form>

<script>
function validateForm(event) {
  event.preventDefault(); // 阻止表单提交

  var input1 = document.getElementById("input1").value;
  var input2 = document.getElementById("input2").value;

  if (input1 === input2) {
    alert("输入的数字不能相同");
  } else {
    // 提交表单
    document.querySelector("form").submit();
  }
}
</script>

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

app.use(express.urlencoded({ extended: true }));

app.post("/submit", (req, res) => {
  const input1 = req.body.input1;
  const input2 = req.body.input2;

  if (input1 === input2) {
    res.send("输入的数字不能相同");
  } else {
    // 处理表单提交逻辑
    res.send("表单提交成功");
  }
});

app.listen(3000, () => {
  console.log("服务器已启动");
});