在node.js中解决承诺之前，then（）回调触发

如注释中所述，将一个函数传递给该函数

then

bar

function foo() {  return new Promise(function(resolve, reject) {    // Do some async stuff    console.log('foo is about to resolve');    resolve();  });}function bar(arg) {  console.log(arg);}foo().then(function(){bar('bar has fired')});