更新时间:2023-12-05 08:47:28
RASG 获得的 http://***.com/a/3211647/982924
函数异步(U,C){
变种D =文档,T ='脚本',
O = d.createElement(T)
S = d.getElementsByTagName(t)的[0];
o.src ='//'+ U;
如果(C){o.addEventListener('负荷',函数(E){C(空,E);},FALSE); }
s.parentNode.insertBefore(O,S);
}
用法:
异步('snapabug.appspot.com/snapabug.js',函数(){
SnapABug.init('XXXXX-XXXXX-XXXXX-XXXXX-XXXXX');
});
块引用>I've created a short function based on Mathias Bynens Optimization of the Google Analytics asynchronous script that goes as following:
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); }
This works great and I've already started using it for several different scripts
// 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');
The problem comes when I encounter a script that needs to be called after it's loaded:
// Snap Engage async('snapabug.appspot.com/snapabug.js'); SnapABug.init('XXXXX-XXXXX-XXXXX-XXXXX-XXXXX');
So I figured I'd turn this into a callback function that would be used as so:
async('snapabug.appspot.com/snapabug.js', function() { SnapABug.init('XXXXX-XXXXX-XXXXX-XXXXX-XXXXX'); });
I did not expect that this would be difficult for me to do but it has turned out that way.
My question is what is the most efficient way to add a callback without overcomplicating the code.
See the jsfiddle: http://jsfiddle.net/JamesKyle/HQDu6/
Thanks RASG for http://***.com/a/3211647/982924
Async function with callback:
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); }
Usage:
async('snapabug.appspot.com/snapabug.js', function() { SnapABug.init('XXXXX-XXXXX-XXXXX-XXXXX-XXXXX'); });