通过onsubmit传递文本%2B

<form onsubmit="submitForm(event)">
  <input type="text" id="textInput" />
  <input type="submit" value="Submit" />
</form>

function submitForm(event) {
  event.preventDefault(); // 阻止表单默认提交行为

  var text = document.getElementById("textInput").value;

  // 发送请求给后端处理
  var xhr = new XMLHttpRequest();
  xhr.open("POST", "后端处理URL", true);
  xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  xhr.onreadystatechange = function() {
    if (xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
      // 请求成功处理逻辑
    }
  };
  xhr.send("text=" + encodeURIComponent(text));
}