function loadJs(url, callback) {
var script = document.createElement('script');
script.type = "text/javascript";
script.charset = "UTF-8";
if(typeof(callback) != "undefined") {
if(script.readyState) {
script.onreadystatechange = function() {
if(script.readyState == "loaded" || script.readyState == "complete") {
script.onreadystatechange = null;
callback();
}
}
} else {
script.onload = function() {
callback();
}
}
}
script.src = url;
document.body.appendChild(script);
}
動態加載js文件
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