setTimeout-回调参数必须是一个函数 [英] setTimeout - callback argument must be a function

问题描述

我的代码一直有效，直到我将node.js更新到版本8.11.3

My code was working until i updated node.js to version 8.11.3

现在，在尝试调用时，我总是收到错误消息回调参数必须是一个函数

Now i always get error "callback argument must be a function" when trying to call a function with setTimeout.

function testFunction(itemid, price) {

  var url = 'https://example.com';
  var options = {
  method: 'get',
  url: url
  }

  request(options, function (err, res, body) {
    var response = JSON.parse(body);

     if(response.status == 'fail'){
        setTimeout(testFunction(itemid, price), 100);
     }
  })

}

推荐答案

setTimeout 的回调参数必须是一个函数。这样写。未经测试，但应该可以。

Callback argument for setTimeout must be a function. Write it like this. Not tested but it should work.

function testFunction(itemid, price) {

    var url = 'https://example.com';
    var options = {
        method: 'get',
        url: url
    }

    request(options, function (err, res, body) {
        var response = JSON.parse(body);
        if(response.status == 'fail'){
            setTimeout(function () {
                testFunction(itemid, price);
            }, 100);
        }
    })
}

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