jquery 如何将参数传递给回调函数到管道中

Question

我有下面这个简单的例子：

function firstFunction(){
  var d = jQuery.Deferred();
  // some very time consuming asynchronous code...
  setTimeout(function() {
    console.log('1');
    d.resolve();
  }, 1000);
  return d.promise();
}
function secondFunction(param){
  console.log('parm = '+param);
  var d = $.Deferred();
  setTimeout(function() {
    console.log('2');
    d.resolve();
  }, 10);
  return d.promise();
}

firstFunction().pipe(secondFunction('OK'));

结果：参数 = 确定 2个 1个我失去了功能之间的同步。如何通过同步将参数传递给 secondFunction 到管道中？

Answer 1

嗯，你需要做一些小改动：

Your code will execute secondFunction immediately and pass the return value from executing it as the argument to firstFunction which is unlikely what you want.

阅读完整答案：Javascript callback function with parameters

console.log = function(message) {
  $('body').append('<div>' + message + '</div>');
}

function firstFunction(){
  var d = jQuery.Deferred();
  // some very time consuming asynchronous code...
  setTimeout(function() {
    console.log('1');
    d.resolve();
  }, 1000);
  return d.promise();
}
function secondFunction(param){
  console.log('parm = '+param);
  var d = $.Deferred();
  setTimeout(function() {
    console.log('2');
    d.resolve();
  }, 10);
  return d.promise();
}

firstFunction().then(function() {
  secondFunction('OK')
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

jquery 如何将参数传递给回调函数到管道中

jquery how to pass parameter to callback function into pipe

javascript

jquery

promise

jquery-deferred