谷歌地图中的函数（响应，状态）是什么意思？

Question

I am trying to create a route planner for a school project and I need to annotate my code to explain what it means/does. Since my JavaScript/Google Maps knowledge is limited and I can't find anything on here, I was wondering what does the following code do/mean.

function(response, status) {
      if (status === 'OK') {
        directionsDisplay.setDirections(response);

Answer 1

By the names of the parameters in your function I infer it is related to HTTP requests, responses and status.

In HTTP, a response is the complete (as its name states) response of a request, the status is one of many different HTTP status, it has an equivalent status code. You can learn about them everywhere .

A status 200 means OK which is the one in your condition. You may be familiar with the following status:

1. 404 : Not found
2. 500 : Internal server error

In your function, response may be the result of a HTTP call containing some valuable data that you bounce to the function directionsDisplay.setDirections .

Exactly what it does depends on the rest of your code.