当“读取”函数多次调用自身时（这实际上是通过块读取文件），我有这个（简化的）代码。问题在于，通过这样做（这就是我的想法），链条丢失，并且从未达到upload（）函数的“then”。
换句话说，“hola”文本永远不会显示在控制台中。写这个的正确方法是什么？
谢谢，
https://jsfiddle.net/yewdmh2o/1/
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet">
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<nav class="navbar navbar-default navbar-static-top">
<div class="container">
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<li class="active"><a href="#">Home</a></li>
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</ol>
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<div class="item active">
<img class="img-responsive" src="https://lh4.googleusercontent.com/-aCIY16PFylg/VsW6L-YwpqI/AAAAAAAAADA/wSTG1QlJLqY/w1310-h524-no/Progression_Val_dIsere.png" alt="...">
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<div class="thumbnail">
<img src="images/massage360x165.jpg" alt="...">
<div class="caption">
<h3>Massage</h3>
<p>...</p>
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</nav>编辑： 在@Bergi的帮助下解决，总是返回一个承诺，它可以保持链接过程并给出所需的结果，如下所示：
reading = function() {
start++;
upload();
};
var start = 0;
var end = 5;
var myArray = [3,5,7];
myArray.reduce(function(promise, item) {
return upload()
.then(function(){
console.log('hola');
})
})
function upload() {
if (start < end) {
console.log('doing')
reading();
} else {
console.log('finished')
return Promise.resolve();
}
}