jQuery中首先出现的.always()或.then()回调是什么? [英] What comes first .always() or .then() callbacks in jQuery?
本文介绍了jQuery中首先出现的.always()或.then()回调是什么?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如果您的函数同时具有.then
和.always
回调,哪个将首先执行?
If you have a function which has both .then
and .always
callbacks, which one will get executed first?
推荐答案
来自 deferred.resolve()
文档:
延迟解决后,任何由添加的doneCallbacks deferred.then()或deferred.done()会被调用.执行回调 按照它们的添加顺序.
When the Deferred is resolved, any doneCallbacks added by deferred.then() or deferred.done() are called. Callbacks are executed in the order they were added.
以下示例:
var $logger = $("#logEntry");
function addLog(content){
$logger.append($("<li/>").html(content));
}
var newPromise = $.Deferred();
$.when(newPromise).done(function() {
addLog("1st $when().done!");
});
newPromise.then(function() {
addLog("1st then!");
}).always(function() {
addLog("1st always!");
}).done(function() {
addLog("1st done!");
}).done(function() {
addLog("2nd done!");
}).always(function() {
addLog("2nd always!");
}).then(function() {
addLog("2nd then!");
});
$.when(newPromise).done(function() {
addLog("2nd $when().done!");
});
addLog("Resolving promise!");
newPromise.resolve();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<ul id="logEntry"></ul>
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