Reference: http://www.tianshan277.com/563.html
effect:
html:
<! DOCTYPE HTML>
<HTML lang = "EN">
<head>
<Meta charset = "UTF-. 8">
<title> JS loading </ title>
<Script> function errorload (elem) { // CDN error IF ( elem.getAttribute ( 'Data-errorTimes') ==. 1 ) {
elem.onerror = null ; // perform after onerror event, is set to clear onerror onerror = null event. return ;
}
elem.setAttribute ( 'Data-errorTimes',. 1 );
var _src = elem.getAttribute ( 'Data-localSrc' );
}
The loadScript (_src, Prevel) { // bring local JS
var _el = document.createElement ( 'Script' );
_el.src = _src;
IF (Prevel) {
prevEl.parentNode.insertBefore (_el, prevEl.nextSibling);
} the else {
document.body.appendChild (_el);
}
}
</ Script>
</ head>
<body>
<P> products </ p>
<P> product 2 </ p>
<P> product three </ p>
<p> product four </ p>
<p> product five </ p>
<Data-Script localSrc = "JS / jquery.js" type = "text / JavaScript" the src = "https://cdn.bootcss.com/jquery/1.8.2/jquery.min.js"
the onerror = "errorload ( the this); "> </ Script>
// this cdn version is correct, the error can be modified version of the test is then test the
</ body>
</ HTML>