外部JSファイルの動的読み込み
function loadScript(src, callback) {
var done = false;
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.src = src;
head.appendChild(script);
// Attach handlers for all browsers
script.onload = script.onreadystatechange = function() {
if ( !done && (!this.readyState ||
this.readyState === "loaded" || this.readyState === "complete") ) {
done = true;
callback();
// Handle memory leak in IE
script.onload = script.onreadystatechange = null;
if ( head && script.parentNode ) {
head.removeChild( script );
}
}
};
}
loadScript("path/to/script.js", function() {
console.log('script loaded');
});