回调嵌套处理
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<!doctype html>
<html>
<head>
<meta charset="utf-8"/>
<title>promise-嵌套处理</title>
<link rel="stylesheet" type="text/css" href="assets/bootstrap.css">
<script src="//g.alicdn.com/kissy/k/5.0.1/seed.js"></script>
</head>
<body>
<h4>成功回调可以返回新的 promise 进行嵌套处理</h4>
<p>查看代码，点击下面按钮观察结果</p>
<button id="demo7" class="btn btn-default btn-sm">点我执行</button>
<script type="text/javascript">
require(['node', 'promise'], function(Node, Promise){
var $ = Node.all;
$('#demo7').on('click', function(){
var d = new Promise.Defer();
d.resolve(1);
var promise = d.promise;
promise.then(function (v) {
var d = new Promise.Defer();
setTimeout(function () {
d.resolve(v + 1);
}, 1000);
return d.promise;
}).then(function (v) {
alert(v); // 一秒后弹出 2
});
});
})
</script>
</body>
</html>