我创建了一个基于 Mathias Bynens Optimization of the Google Analytics asynchronous script 的简短函数如下:
function async(src) {
var d = document, t = 'script',
o = d.createElement(t),
s = d.getElementsByTagName(t)[0];
o.src = '//' + src;
s.parentNode.insertBefore(o, s);
}
这非常有效,我已经开始将它用于几个不同的脚本
// Crazy Egg
async('dnn506yrbagrg.cloudfront.net/pages/scripts/XXXXX/XXXXX.js?' + Math.floor(new Date().getTime() / 3600000));
// User Voice
var uvOptions = {};
async('widget.uservoice.com/XXXXX.js');
// Google Analytics
var _gaq = [['_setAccount', 'UA-XXXXX-XX'], ['_setDomainName', 'coachup.com'], ['_trackPageview']];
async('google-analytics.com/ga.js');
// Stripe
async('js.stripe.com/v1');
当我遇到加载后需要调用的脚本时,问题就出现了:
// Snap Engage
async('snapabug.appspot.com/snapabug.js');
SnapABug.init('XXXXX-XXXXX-XXXXX-XXXXX-XXXXX');
所以我想我应该把它变成一个回调函数,这样使用:
async('snapabug.appspot.com/snapabug.js', function() {
SnapABug.init('XXXXX-XXXXX-XXXXX-XXXXX-XXXXX');
});
我没想到这对我来说很难做到,但结果却是这样。
我的问题是添加回调而不使代码过于复杂的最有效方法是什么。
See the jsfiddle: http://jsfiddle.net/JamesKyle/HQDu6/
最佳答案
谢谢RASG对于 https://stackoverflow.com/a/3211647/982924
带回调的异步函数:
function async(u, c) {
var d = document, t = 'script',
o = d.createElement(t),
s = d.getElementsByTagName(t)[0];
o.src = '//' + u;
if (c) { o.addEventListener('load', function (e) { c(null, e); }, false); }
s.parentNode.insertBefore(o, s);
}
用法:
async('snapabug.appspot.com/snapabug.js', function() {
SnapABug.init('XXXXX-XXXXX-XXXXX-XXXXX-XXXXX');
});
关于javascript - 异步脚本加载回调,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12820953/