function(url) {
		var element = doc.createElement('script');
		element.src = url;
		element.async = true;
		element.defer = true;
		container.appendChild(element);
		return element;
	}
function(url) {
		var element = doc.createElement('script');
		element.src = url;
		element.async = true;
		element.defer = true;
		container.appendChild(element);
		return element;
	}
function ( url ) { var element = doc . createElement ( 'script' ) ; element . src = url ; element . async = true ; element . defer = true ; container . appendChild ( element ) ; return element ; }
导入 script 元素
导入 script 元素
Creates a script element