核心代码：
from flask import Flask, render_template, request, jsonify
app = Flask(__name__)
@app.route('/')
def index():
return render_template("index.html")
#接受前台消息
@app.route('/receive_message', methods=['GET'])
def send_message():
global message_get #定义全局对象（全局变量）
message_get = "" #初始化全局对象
message_get = request.args['message'] #接受前台变量
print("收到前端页面变量值：",message_get)
# print("收到前端发过来的信息：%s" % message_get)
return "数据传递成功！"
if __name__ == '__main__':
app.run()
DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Titletitle>
head>
<body>
<div>
<label for="send_content">向后台发送消息：label>
<input id="send_content" type="text" name="send_content">
<input id="send" type="button" value="发送">
div>
<script src="/static/js/jquery-3.6.0.min.js">script>
<script type="text/javascript">
$("#send").click(function () {
var message = $("#send_content").val()
$.ajax({
url:"http://127.0.0.1:5000/receive_message",
type:"GET",
data:{
message:message
},
success:function (data) {
alert(data)
},
error:function () {
alert("接收失败")
}
})
})
script>
body>
html>
效果截图：