Question

这基本上就是我想要做的：

var sendRequest= false;  //may be true

https.request(request_params, function(response){  //only sends a request if sendRequest == true
    //do something with response if request has been sent      
    someObjWithCallback.itsfunction(its_params, function(resp){
          //do something with response
    }        
}

如何确保仅在sendRequest条件为true时运行https.request。

注意：someObjWithCallback.itsfunction（..）必须在两种情况下运行（sendRequest为true或false）。因此，回调函数必须在任何情况下都运行。

Answer 1

您可以使用if语句检查变量：

if (sendRequest) {
  https.request(request_params, function(response){  //only sends a request if sendRequest == true
    //do something with response if request has been sent      
    someObjWithCallback.itsfunction(its_params, function(resp){
          //do something with response
    }        
  })
}

或利用&&运算符（并阅读this excellent article）

sendRequest && https.request(request_params, function(response){  //only sends a request if sendRequest == true
    //do something with response if request has been sent      
    someObjWithCallback.itsfunction(its_params, function(resp){
          //do something with response
    })     
}

或弄乱三元表达式（但前提是您想在请求为false时对请求执行代替的操作）

sendRequest ? https.request(request_params, function(response){  //only sends a request if sendRequest == true
    //do something with response if request has been sent      
    someObjWithCallback.itsfunction(its_params, function(resp){
          //do something with response
    }        
}) : console.log('lol, don't actually do this if you dont have an "else" condition...')

如何做一个有条件的https请求？

1 个答案: