jquery - 如何在 Flask 中使用 Ajax

Question

我正在可视化实时图表，就像这里的例子:Highcharts .基本上，它是对来自生成随机数据的 PHP 脚本 live-server-data.php 的数据的 Ajax 请求:

/**
 * Request data from the server, add it to the graph and set a timeout 
 * to request again
 */
function requestData() {
    $.ajax({
        url: '/',
        success: function(point) {
            var series = chart.series[0],
                shift = series.data.length > 20; // shift if the series is 
                                                 // longer than 20

            // add the point
            chart.series[0].addPoint(point, true, shift);

            // call it again after one second
            setTimeout(requestData, 1000);    
        },
        cache: false
    });
}


//---live-server-data.php
<?php 
$x = time() * 1000;  
$y = rand(0, 100);   
$ret = array($x, $y);
echo json_encode($ret);
?>

如何在 Flask 中做类似的事情，即从 Flask 请求随机生成的数字？

from flask import Flask, render_template, request, jsonify
import random, datetime, json
import time

app = Flask(__name__)

@app.route('/')
def index():

    x = int(round(time.time() * 1000))
    y = random.randint(0, 100)
    return json.dumps([x, y])


if __name__ == '__main__':
    app.run(debug=True)

Answer 1

在 Flask 中更简单:

@app.route('/')
def index():
    x = datetime.timestamp(datetime.now()) * 1000
    y = random.randint(0, 100)
    return json.dumps([x, y])

但请注意，您必须在顶部添加以下导入才能使其正常工作:

import random, datetime, json
from datetime import datetime