微信小程序循环发送请求,用setInterval解决异步加载

最近遇到一个场景,需要我读取一个数组的内容,然后写个for循环来发送请求,在请求发送结束后调用一个函数,代码如下
getFoodList: function () {
    var that = this ;
    for ( var i = 0 ; i < that.data.recordDate.length; i++) {
      var date = that.data.recordDate[i].date;
      wx.request({
        url: getApp().globalData.url
        data: {
          secretKey: that.data.secretKey,
          eatDate: date
        },
        header: {
          'content-type' : 'application/json'
        },
        success: function (res) {
          if (res.data.foodLists != undefined )
            that.data.foodInfo.push(res.data.foodLists);
          that.setData(
            {
              foodInfo: that.data.foodInfo
            }
          )
        }
      })
    }
that.setShowFlag();
},
因为微信小程序异步加载的特性,这样写显然无法满足我执行完请求后调用方法的需求。
对此,最优秀的解决方案应该是用promise,网上有许多博客,但我一时半会没能用起来,这边给大家推荐一个蠢办法,解决燃眉之急。就是使用setInterval让他等待请求执行,等请求执行完毕了再调用你希望调用的方法。
代码如下:
   
var timer = setInterval( function () {
      console.log( "循环定时器等待循环请求结束" )
      console.log( "that.data.recordDate.length:" + that.data.recordDate.length)
      console.log( "that.data.foodInfo.length:" + that.data.foodInfo.length)
      if (that.data.recordDate.length == that.data.foodInfo.length)
      {
        that.setShowFlag();
        clearInterval(timer);
      }
    }
      , 500 )



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转载自blog.csdn.net/weixin_42253152/article/details/80492170