从javascript函数返回一个值，然后在其中执行代码

Question

I have a javascript function which needs to return true in order to update the browser UI. How can I make sure the function returns before executing the code to make a backend call?

 self.resortCopy = function(item) {
 self.resorts.push(item);
 self.backendCall(item) // this needs to be performed after returning true
 return true;

Answer 1

I imagine you are having a ajax request inside self.backendCall (XHR/fetch)

If that is true, then your code already async

Else, look at @hemp's answer

 function ajax(){ fetch("https://httpbin.org/get").then(data=>{ console.log("DONE") }) } function test(){ ajax(); return true; } console.log(test()) 

Answer 2

Assuming browser JS, you can use setTimeout universally, this will guarantee that the current codepath finishes before the backendCall code executes, but it doesn't say anything else about when (unless you specify a timeout period.)

self.resortCopy = function(item) {
self.resorts.push(item);
window.setTimeout(self.backendCall.bind(self, item), 0);
return true;