jQuery动态加载程序-如果jQ未定义或不存在，则使用纯js javascript加载jQuery

Posted 2021-02-25

// jQuery dynamic loader - load jQuery using pure javascript js
// if jQuery is undefined or does not exist, then load it
 
if ( !window.jQuery ) {
	var jqscript = document.createElement('script');
	jqscript.setAttribute("type", "text/javascript");
	jqscript.setAttribute("src", "http://code.jquery.com/jquery.min.js");
	document.getElementsByTagName("head")[0].appendChild(jqscript);
};