function loadFile(url, callBack) {
var fileNode = document.createElement('script'),
fun = function () {
document.body.removeChild(fileNode);
callBack && callBack();
};
if (fileNode.readyState)
fileNode.onreadystatechange = function () {
if (fileNode.readyState == "loaded" || fileNode.readyState == "complete") {
fileNode.onreadystatechange = null;
fun();
}
};
else fileNode.onload = fun;
fileNode.src = host + url;
document.body.appendChild(fileNode);
}
转载于:https://my.oschina.net/hxwny/blog/391884