Question

我的for循环中有ajax请求，我正在尝试打印迭代索引的值＆＃39; i＆＃39;在每次迭代中。我在for循环中使用包装函数（在许多帖子中建议）来执行ajax。但是当我打印控制台的值时，它会以随机的方式打印出来。每次我运行for循环时，它都是不同的。

这是我的for循环和包装函数

 get_process_status(){                  //new

        for(var i=0; i<this.state.current_auto_video_jobs_urls.length; i++){
            this.get_auto_video_jobs_array(i)
        }
    }

//wrapper function

    get_auto_video_jobs_array(i){
        var that = this;
        var settings_3 = {
            "async": true,
            "crossDomain": true,
            "url": that.state.current_auto_video_jobs_urls[i],
            "method": "GET",
            "headers": {
                Authorization: "Token " + that.props.token_Reducer.token
            },
            success: function (response, textStatus, jQxhr) {
                console.log("success")
                console.log("value of i is " + i)
            },
        }

        $.ajax(settings_3).done((response) => {
            auto_video_jobs_array.push(response)
            if(i == that.state.current_auto_video_jobs_urls.length -1 ){
                console.log("i reached last value")
                that.setState({current_auto_video_jobs: auto_video_jobs_array})
                console.log("current jobs are" + that.state.current_auto_video_jobs)
            }
        });
    }

控制台输出

你可以看到2次，i打印的值是不同的序列。为什么每次循环运行时序列只能是0到9？

Answer 1

因为名称建议（异步Javascript和XML）的AJAX是异步，这意味着它不会按顺序运行。要使代码工作，您必须将循环放在Ajax请求的from flask import Flask, jsonify, request from flasgger import Swagger from rulesEnginePy.RiskOfCancellation.RiskOfCancellation import RiskOfCancellation from logging.handlers import RotatingFileHandler import logging from datetime import datetime app = Flask(name) Swagger(app, template={ 'swagger': '2.0', 'info': { 'title': 'RRRE RofCXL API', 'description': 'API for RRRE (Right Revenue Rules Engine) RofCXL (Risk of Cancellation)', }, 'basepath': '/api', }) log_handler = RotatingFileHandler(app.root_path + '/../logs/rrre.log', maxBytes=10000000, backupCount=10) log_handler.setLevel(logging.INFO) formatter = logging.Formatter('%(asctime)s | %(pathname)s:%(lineno)d | % (funcName)s | %(levelname)s | %(message)s') log_handler.setFormatter(formatter) app.logger.addHandler(log_handler) @app.route('/api//calculate/4', methods=['GET']) def calculate4(name): try: app.logger.info('About to use service %s' % name) sampleDate = datetime.strptime(request.args.get('date'), '%Y-%m-%d') # for id, sample in samples.items(): WOM = calculators[name].week_of_month(sampleDate) DOW = sampleDate.weekday()+1 riskOfCancellation = RiskOfCancellation.calculateRiskOfCancellationMOYDOW(int(sampleDate.month),int(DOW)) app.logger.info( 'Calculated Risk of Cancellation {0} for DOM {1}, DOW {2}, WOM {3} and MOY {4}'.format( riskOfCancellation, sampleDate.day, DOW, WOM, sampleDate.month ) ) calculations = { 'DOM': sampleDate.day, 'DOW': DOW, 'WOM': WOM, 'MOY': sampleDate.month, 'riskOfCancellation': riskOfCancellation } app.logger.info('Done making calculations for request for calculate 4') return jsonify({ 'data': calculations, }) except KeyError: return jsonify({ 'errors': [{ 'code': '1000', 'title': 'A service with the given name doesn't exist', }], }), 404处理程序

中

for循环中的ajax不按顺序运行

1 个答案: