如何在JavaScript中清除递归调用中的间隔

Question

I am using setInterval(); function to run a function every 5 sec, but i want to clear this interval if some condition satisfied.

function do_the_job(){ 
 //some code
 if(some_condition)
  {
     clearInterval(interval);
  }else{
      clearInterval(interval);
      var interval = setInterval(do_the_job(),5000);
      }
 }

function clearInterval(); is not working here.

Answer 1

通过将其声明移至if语句之外，使interval成为全局变量或“更高范围的变量”，以便在清除时实际上将其置于范围内。

Answer 2

This is not a good time to use setInterval() , try setTimeout() instead

function do_the_job(){ 
 //some code
 if(some_condition)
  {
     // job done
  }else{
      setTimeout(do_the_job,5000);
      }
 }

Answer 3

In your code the var interval =... is local, not visible outside the scope of the function call, and thus will not work in a recursive function.

Make the interval a global variable, and it will work.

solution

var interval;
function do_the_job(){ 
 //some code
 if(some_condition)
  {
     clearInterval(interval);
  }else{
      clearInterval(interval);
      interval = setInterval(do_the_job(),5000);
      }
 }

Answer 4

 var interval = setInterval(do_the_job(),5000);

不应有假肢

 var interval = setInterval(do_the_job,5000);